List of Publications

2018 2017 2016 2015 2014 2013 2012 2011 2010 2009 2008 2007 2006 2005 2004 2003 2002 2001 2000 1999 1998 1997 1996

2018
T. Xiong, Y. W. Liu*, K. Yang, X. C. Huang, S. X. Wang, S. Yan, K. L. Yu, N. Hiraoka, K. D. Tsuei and L. F. Zhu*, Optical oscillator strengths of the vibronic excitations of molecular deuterium determined by the dipole (r, r) mthod, Phys. Rev. A (Accepted)

Y. W. Liu, L. Q. Xu, T. Xiong, X. Chen, K. Yang*, N. Hiraoka, K. D. Tsuei and L. F. Zhu*, Oscillator strengths and integral cross sections of the valence-shell excitations of oxygen molecule studied by fast electron and inelastic X-ray scattering, Astrophys. J. Suppl. S. (accepted)

D. D. Ni, X. Kang, S. Yan, X. C. Huang, T. Xiong, D. X. Liang, K. Yang* and L. F. Zhu*, A 1-meter non-resonant inelastic x-ray scattering spectrometer at BL15U, Shanghai synchrotron radiation facility, Rev. Sci. Instrum. 89, 085108(2018)

L. Q. Xu, Y. G. Peng, T. Xiong, X. Xiu, Y. W. Liu, Y. Wu*, J. G. Wang, and L. F. Zhu*, Inelastic squared form factors of the vibronic states of B1, C1?and EF1?for molecular hydrogen deuteride studied by the fast electron scattering, Phys. Rev. A 98, 012502(2018)

S. X. Wang, X. Xu, Z. K. Huang, W. Q. Wen*, H. B. Wang, N. Khan, S. P. Preval, N. R. Badnell, S. Schippers, S. Mahmood, L. J. Dou, X. Y. Chuai, D. M. Zhao, X. L. Zhu, L. J. Mao, X. M. Ma, J. Li, R. S. Mao, Y. J. Yuan, M. T. Tang, D. Y. Yin, J. C. Yang, X. Ma*, and L. F. Zhu*, Electron-ion Recombination Rate Coefficients of Be-like 40Ca16+, Astrophys. J. 862, 134(2018)

X. C. Huang, L. Q. Xu, D. D. Ni, Y. W. Liu, Y. G. Peng, K. Yang*, N. Hiraoka, K. D. Tsuei and L. F. Zhu*, Elastic squared form factor and binding effect of carbon dioxide studied by the high resolution x-ray scattering, J. Electro. Spec. Relat. Phenom. 226, 41-44(2018)

W. Q. Xu, L. Q. Xu, D. G. Qi, T. Chen, Y. W. Liu and L. F. Zhu*, Investigations of the valence-shell excitations of molecular ethane by the high-energy electron scattering, J. Chem. Phys. 148, 144313(2018)

Z. K. Huang, W. Q. Wen*, X. Xu, S. Mahmood, S. X. Wang, H. B. Wang, L. J. Dou, N. Khan, N. R. Badnell, S. P. Preval, S. Schippers, T. H. Xu, Y. Yang, K. Yao, W. Q. Xu, X. Y. Chuai, X. L. Zhu, D. M. Zhao, L. J. Mao, X. M. Ma, J. Li, R. S. Mao, Y. J. Yuan, B. Wu, L. N. Sheng, J. C. Yang, L. F. Zhu and X. W. Ma*, Dielectronic and trielectronic recombination rate coefficients of Be-like Ar14+, Astrophys. J. Suppl. S. 235:2 (2018)

L. Q. Xu, X. Kang, Y. G. Peng, X. Xu, Y. W. Liu, Y. Wu*, K. Yang, N. Hiraoka, K. D. Tsuei, J. G. Wang and L. F. Zhu*, Comparative study of inelastic squared form factors of the vibronic states of B1Su+, C1Pu and EF1Sg+ for molecular hydrogen: inelastic x-ray and electron scattering, Phys. Rev. A 97, 032503(2018)

X. Xu, L. Q. Xu, T. Xiong, T. Chen, Y. W. Liu and L. F. Zhu*, Oscillator strengths and integral cross sections for the valence-shell excitations of nitric oxide studied by fast electron impact, J. Chem. Phys. 148, 044311(2018)

Y. W. Liu, L. Q. Xu, T. Chen, D. G. Qi, T. Xiong and L. F. Zhu*, Oscillator strengths and integral cross sections of the valence-shell excitations of acetylene studied by the high-energy electron-scattering, Astrophys. J. Suppl. S. 234:10 (2018)

S. Sardar*, X. Xu, L. Q. Xu and L. F. Zhu*, Relativistic R-matrix calculations for photoionization cross sections of C IV: implications for photorecombination of C V, Mon. Not. R. Astron. Soc. 474, 1752-1761(2018)

2017
X. C. Huang, W. B. Li, X. J. Kong and L. F. Zhu*, Field redistribution inside an X-ray cavity-QED setup, Opt. Express, 25, 31337(2017)

Y. Zhang, X. Wang, L. F. Zhu, D. Lu, R. Hutton, Y. Zou and B. Wei, Studies of N2 dissociative ionization by electron impact, J. Phys. B 50, 205202(2017)

Z. K. Huang, W. Q. Wen, X. Xu, H. B. Wang, L. J. Dou, X. Y. Chuai, X. L. Zhu, D. M. Zhao, J. Li, X. M. Ma, L. J. Mao, J. C. Yang, Y. J. Yuan, W. Q. Xu, L. Y. Xie, T. H. Xu, K. Yao, C. Z. Dong, L. F. Zhu and X. Ma*, Dielectronic recombination experiments at the storage rings: from the present CSR to the future HIAF, Nucl. Instrum. Meth. Phys. Res. B 408, 135-139(2017)

D. D. Ni, L. Q. Xu, Y. W. Liu, K. Yang*, N. Hiraoka, K. D. Tsuei and L. F. Zhu*, Comparative study of the low-lying valence electronic states of carbon dioxide by high-resolution inelastic x-ray and electron scattering, Phys. Rev. A 96, 012518(2017)

L. Q. Xu, Y. W. Liu, X. Xu, D. D. Ni, K. Yang and L. F. Zhu*, Optical oscillator strengths of the valence-shell excitations of atoms and molecules determined by the dipole (r, r) method, Eup. Phys. J. D 71, 183(2017)

Y. W. Liu, L. Q. Xu, D. D. Ni, X. Xu, X. C. Huang and L. F. Zhu*, Integral cross sections of the dipole-allowed excitations of nitrogen molecule studied by the fast electron scattering, J. Geophys. Research Space Phys. 122, 3459-3468(2017)

2016
Y. Y. Wang, Y. W. Liu, X. Kang, X. L. Zhao, L. Wang, C. Z. Hu, J. Chen, F. Y. Liu, L. S. Sheng and L. F. Zhu*, Dissociative photoionization of 1,2-epoxyoctane studied with synchrotron radiation, Chin. J. Chem. Phys. 29, 533(2016)

X. X. Mei, X. L. Zhao, L. Q. Xu, Y. W. Liu, X. Kang, S. Yan, D. D. Ni, K. Yang* and L. F. Zhu*, Investigation of Compton profile of molecular propane, Chin. Phys. Lett. 33, 093301(2016)

X. Xu, D. D. Ni, X. Kang, Y. W. Liu, L. Q. Xu, K. Yang*, N. Hiraoka, K. D. Tsuei, and L. F. Zhu*, Absolute optical oscillator strengths of the 3p54s and 3p54s? transitions of argon measured by the dipole (r,r) method, J. Phys. B 49, 064010(2016)

Y. W. Liu, X. Kang, L. Q. Xu, D. D. Ni, K. Yang*, N. Hiraoka, K. D. Tsuei, and L. F. Zhu*, Absolute optical oscillator strengths of vibronic excitations of N2 studied by the dipole(r,r) method, Astrophys. J. 819,142（2016）

Y. G. Peng, Y. Wu, L. F. Zhu, S. B. Zhang, J. G. Wang, H. P. Liebermann, and R. Buenker, Complex multireference configuration interaction calculations for the K-vacancy Auger states of Nq+(q=2-5), J. Chem. Phys. 144, 054306(2016)

2015

L. Q. Xu, Y. W. Liu, X. Kang, D. D. Ni, K. Yang, N. Hiraoka, K. D. Tsuei and L. F. Zhu*, The realization of the dipole(r,r) method and its application to determine the absolute optical oscillator strengths of helium, Sci. Rep. 5，18350(2015)

X. T. Zhu, Y. W. Cao, S. Y Zhang, X. Jia, Q. L. Guo, F. Yang, L. F. Zhu, J. D. Zhang, E. W. Plummer and J. D. Guo, High resolution electron energy loss spectroscopy with two-dimensional energy and momentum mapping, Rev. Sci. Instrum. 86, 083902(2015)

X. Zhang, Y. W. Liu, Y. G. Peng, L. Q. Xu, D. D. Ni, X. Kang, Y. Y. Wang, Y. Y. Qi, and L. F. Zhu*, Fast-electron-impact study on excitations of 4d electron of xenon, Chin. Phys. B 24, 123401(2015)

X. Kang, Y. W. Liu, L. Q. Xu, D. D. Ni, K. Yang，N. Hiraoka, K. D. Tsuei and L. F. Zhu*, Oscillator strength measurement for the A (0-6)-X (0), C (0)-X (0) and E (0)-X (0) transitions of CO by the dipole (g,g) method, Astrophys. J. 807, 96(2015)

2014
Y. G. Peng, X. Kang, K. Yang*, X. L. Zhao, Y. W. Liu, X. X. Mei, B. P. Xie, D. L. Feng, N. Hiraoka, K. D. Tsuei, and L. F. Zhu*, Squared form factors of vibronic excitations in 12-13.3 eV of nitrogen studied by high-resolution inelastic x-ray scattering, Phys. Rev. A 89, 032512(2014)

M. Lin, Y. W. Liu, Z. P. Zhong, L. F. Zhu*, Investigations of decay pathways of superexcited states of nitrous oxide, Chin. Phys. B 23, 053403(2014)

M. Vos, R. P. McEachran, and L. F. Zhu, A comparison of the theoretical and experimental results for keV electron scattering from argon, J. Phys. B 47，055201(2014)

Y. W. Liu, X. X. Mei, X. Kang, K. Yang*, W. Q. Xu, Y. G. Peng, N. Hiraoka, K. D. Tsuei, P. F. Zhang, and L. F. Zhu*, Determination the electronic structure of atoms and molecules in ground state: measurement for molecular hydrogen by high-resolution x-ray scattering, Phys. Rev. A 89, 014502 (2014)

Y. Y. Wang, X. Kang, Y. W. Liu, W. Q. Xu, L. Wang, C. Z. Hu, J. Chen, F. Y. Liu, L. S. Sheng, X. L. Zhao, P. F. Zhang, L. F. Zhu*, Investigations of dissociative photoionization of isooctane by synchrotron radiation, Int. J. Mass Spectr. 359,1（2014）

W. Q. Xu, X. L. Zhu, X. Ma, W. Q. Wen, Y. Gao, S. L. Wang, R. T. Zhang, B. Li, Y. Zhang, D. M. Zhao, H. P. Liu, J. Liu, and L. F. Zhu, Development of a single-particle detector for the dielectronic recombination experiment on HIREF-CSRm, Nucl. Instrum. Meth. Phys. Res. A, 735, 552-556(2014)

2013
R. P. McEachran, M. Vos and L. F. Zhu, Fast-electron scattering from Ne: A comparison of distorted-wave theory with experiment, Phys. Rev. A 87，052703(2013)

M. Lin, Y. W. Liu, Z. P. Zhong, L. F. Zhu*, Momentum transfer dependence behaviors of ionization and dissociation of oxygen, Chin. Phys. B 22, 023404(2013)

2012
X. Kang, K. Yang*, Y. W. Liu, W. Q. Xu, N. Hiraoka, K. D. Tsuei, P. F. Zhang, and L. F. Zhu*, Squared form factors of valence-shell excitations of atomic argon studied by high-resolution inelastic x-ray scattering，Phys. Rev. A 86,022509(2012)

Y. W. Liu, Y. Y. Wang and L. F. Zhu*, Valence-shell excitations of nitrous oxide studied by fast electron impact, Chin. Phys. Lett. 29，043302(2012)

L. F. Zhu*, W. Q. Xu, K. Yang, Z. Jiang, X. Kang, B. P. Xie, D. L. Feng, N. Hiraoka, and K. D. Tsuei, Dynamic Behavior of Valence-Shell Excitations of Atomic Neon Studied by High-Resolution Inelastic X-Ray Scattering, Phys. Rev. A 85，030501（R）(2012)

2011
L. M. Ren, Y. Y. Wang, D. D. Li, Z. S. Yuan andL. F. Zhu*, Inner-Shell Excitations of 2p Electrons of Argon Investigated by Fast Electron Impact with High Resolution, Chin. Phys. Lett. 28, 053401(2011)

L. F. Zhu*, L. S. Wang, B. P. Xie, K. Yang, N. Hiraoka, Y. Q. Cai, D. L. Feng*, Inelastic X-ray scattering study on the single excitations of helium, J. Phys. B 44，025203(2011)

2010
L. F. Zhu*, W. Q. Xu, J. M. Sun and W. Y. Zhang, The Investigation of Optically Forbidden Transition of in Oxygen, Chin. Phys. Lett. 27，113301(2010)

W. Q. Xu, J. M. Sun, Y. Y. Wang and L. F. Zhu*, Generalized oscillator strengths and integral cross sections for the valence shell excitations of oxygen studied by fast electron impact, Phys. Rev. A 82，042716(2010)

B. P. Xie, L. F. Zhu*, K. Yang, B. Zhou, N. Hiraoka, Y. Q. Cai, Y. Yao, C. Q. Wu, E. L. Wang, D. L. Feng*，High-resolution inelastic X-ray scattering studies of the state-resolved differential cross-section of the Compton excitations in helium atoms, Phys. Rev. A 82, 032501(2010)

Y. Y. Wang, J. M. Sun, and L. F. Zhu*, Cross sections for the valence shell excitations of nitrous oxide studied by fast electron impact, J. Chem. Phys. 132, 124301(2010)

L. F. Zhu*, The valence shell excitations for some noble atoms studied by fast electron impact, J. Phys. Conf. Series, 235, 012007(2010)

2009
X. Y. Han, Y. M. Li, J. Yan andL. F. Zhu, The generalized oscillator strengths for Na: monopole, dipole and quadrupole transitions, J. Phys. B: At. Mol. Opt. Phys. 42, 195003(2009)

L. F. Zhu*, X. J. Chen*, X. Shan and K. Z. Xu, Recent progress in electron impact experiments in Hefei, AIP Conf. Proc. 1125, 49 (2009)

2008
M. Ge, L. F. Zhu*, C. D. Liu and K. Z. Xu, Optically forbidden excitations of 2s electron of neon studied by fast electron impact, Chin. Phys. Lett., 25, 3646(2008)

L. F. Zhu* and K. Z. Xu, Dynamic behavior for valence shell excitation processes of noble atoms studied by fast electron impact, JSPS-CAS cor university program seminar, Proceedings of Japan-China Joint Seminar on Atomic and Molecular Processes in Plasma, 28-33(2008)

W. C. Jiang, L. F. Zhu* and K. Z. Xu, Inner shell excitations of lithium studied by fast electron impact, Chin. Phys. Lett. 25, 3649(2008)

2007
L. F. Zhu*, F. X. Zhang, H. D. Cheng, H. Yuan, Z. S. Yuan, W. B. Li, X. J. Liu and K. Z. Xu, Generalized oscillator strengths for some higher valence-shell excitations of krypton, Chin. Phys. 16，2938(2007)

L. F. Zhu*, H. Yuan, W. C. Jiang, F. X. Zhang, Z. S. Yuan, H. D. Cheng and K. Z. Xu, Generalized oscillator strengths for some higher valence shell excitations of argon, Phys. Rev. A 75, 032701(2007)

2006
Z. S. Yuan, Y. Sakai, N. Umeda, Y. Fujita, T. Takayanagi, C. Yamada, N. Nakamura, S. Ohtani, L. F. Zhu and K. Z. Xu, Autoionization states in xenon investigated by electron impact, J. Phys. B 39, 5097(2006)

W. B. Li, L. F. Zhu*, X. J. Liu, Z. S. Yuan and K. Z. Xu, Optical oscillator strengths for valence-shell and Br-3d inner-shell excitations of HCl and HBr, J. Chem. Phys. 125, 154310(2006)

L. F. Zhu*, H. D. Cheng, Z. S. Yuan, X. J. Liu, J. M. Sun and K. Z. Xu, Generalized oscillator strengths for the valence shell excitations of argon, Phys. Rev. A 73, 042703(2006)

2005
L. L. Fan, Z. P. Zhong, L. F. Zhu*, X. J. Liu, H. D. Cheng, Z. S. Yuan and K. Z. Xu, Superexcited states of carbon monoxide studied by fast-electron impact, Chin. Phys. 14, 2478(2005)

H. D. Cheng, L. F. Zhu*, X. J. Liu, Z. S. Yuan, J. M. Sun, W. C. Jiang and K. Z. Xu, Generalized oscillator strengths for valence shell excitations of neon, Phys. Rev. A 72, 012715(2005)
?
J. M. Sun, Z. P. Zhong, L. F. Zhu*, X. J. Liu, Z. S. Yuan and K. Z. Xu, Absolute oscillator strength densities below 100 eV of N2, Chin. Phys. 14，1378(2005)

Z. S. Yuan, L. F. Zhu*, X. J. Liu, W. B. Li, H. D. Cheng, J. M. Sun and K. Z. Xu, Inner-shell excitations of krypton 3d investigated by electron impact with high resolution, Phys. Rev. A 71，064701(2005)

L. F. Zhu*, H. F. Ren, X. J. Liu, Z. S. Yuan, Y. Wu and K. Z. Xu, Electron-impact excitation of in carbon monoxide, J. Chem. Phys. 122，224303(2005)

H. D. Cheng,L. F. Zhu*, X. J. Liu, Z. S. Yuan, W. B. Li and K. Z. Xu, Selectivity in valence excitation processes of noble atoms studied by fast electron impact, Phys. Rev. A 71，032714 (2005)

L. L. Fan, Z. P. Zhong, L. F. Zhu, X. J. Liu, Z. S. Yuan, J. M. Sun and K. Z. Xu, Superexcited states of oxygen studied by fast-electron impact, Phys. Rev. A 71，032704(2005)


2004
Z. S. Yuan, X. Y. Han, X. J. Liu, L. F. Zhu*, K. Z. Xu, L. Voky and J. M. Li, Theoretical investigations on the dynamical correlation in double excitations of helium by the R-Matrix method, Phys. Rev. A 70, 062706(2004)

J. M. Sun, Z. P. Zhong, L. F. Zhu, W. B. Li, X. J. Liu, Z. S. Yuan and K. Z. Xu, Superexcited states of NO studied by angle-resolved electron-energy-loss spectroscopy, Phys. Rev. A 70，012708(2004)

X. J. Liu, L. F. Zhu, Z. S. Yuan, W. B. Li, H. D. Cheng, J. M. Sun and K. Z. Xu, The generalized oscillator strengths for the valence shell excitations in helium by fast electron impact, J. Electro. Spec. Relat. Phenom., 135(2004)15

W. B. Li,L. F. Zhu*, X. J. Liu, Z. S. Yuan, J. M. Sun, H. D. Cheng and K. Z. Xu, Optical oscillator strength of hydrogen bromide in the 4.5-20 eV excitation energy region, Chin. Phys. Lett.,21(2004)656


2003
W. B. Li, L. F. Zhu*, X. J. Liu, Z. S. Yuan, J. M. Sun, H. D. Cheng, Y. Sakai and K. Z. Xu, Optical oscillator strength of hydrogen chloride in the energy region of 5.5-20 eV, Chin. Phys. Lett.,20，2152（2003）

X. J. Liu, L. F. Zhu, Z. S. Yuan, W. B. Li, H. D. Cheng, Y. P. Huang, Z. P. Zhong, K. Z. Xu and J. M. Li, Dynamical correlation in double excitations of helium studied by high-resolution & angular-resolved fast-electron energy loss spectroscopy in absolute measurement, Phys. Rev. Lett. 91(2003)193203

L. F. Zhu*, H. D. Cheng, X. J. Liu, P. Tian, Z. S. Yuan, W. B. Li and K. Z. Xu, Optically forbidden excitations of 3s electron of argon by fast electron impact, Chin. Phys. Lett. 20， 1718（2003）

X.J. Liu, Y. P. Huang, L. F. Zhu, Z. S. Yuan, W. B. Li and K. Z. Xu, Numerical determination of profile parameters for Fano resonances with definite energy resolution, Nucl. Instrum. Meth. In Phys. Res. Sec. A, Accelerators, Spectrometers, Detectors and Associated Equipments. 508，448（2003）

W. B. Li, L. F. Zhu*, X. J. Liu, Z. S. Yuan, J. M. Sun, H. D. Cheng, Z. P. Zhong and K. Z. Xu, Generalized oscillator strengths for 5s, 5s’ and 5p excitations of krypton, Phys. Rev. A 67，062708(2003)

2002
Z. S. Yuan, L. F. Zhu, X. J. Liu, Z. P. Zhong, W. B. Li, H. D. Cheng and K. Z. Xu, Fast-electron-impact study on excitations of 4p, 4s and 3d electrons of krypton, Phys. Rev. A 66, 062701(2002)

Z. S. Yuan, L. F. Zhu, X. Tong, W. B. Li, X. J. Liu and K. Z. Xu, Which is the most stable one in WSin(n=1-4)? A density functional investigation with pseudo-potential model, J. Mol. Struct.: theochem., 589-590,229-237(2002)

L. F. Zhu, Z. P. Zhong, Z. S. Yuan, W. H. Zhang, X. J. Liu, X. M. Jiang, K. Z. Xu and Jia-Ming LI, Experimental and theoretical investigations of absolute optical oscillator strengths for the valence excitations of nitric oxide, Chin. Phys. 11, 1149(2002)

Z. S. Yuan, L. F. Zhu, X. J. Liu, W. B. Li and K. Z. Xu, Photoabsorption spectrum and optically forbidden transitions of krypton by electron impact, Chin. Phys. Lett., 19, 495-496(2002)


2001
X. J. Liu, L. F. Zhu, X. M. Jiang, Z. S. Yuan, B. Cai, X. J. Chen and K. Z. Xu, Application of a multi-channel detection system to the high-resolution fast electron energy loss spectrometer, Rev. Sci. Instrum., 72,3357-3361(2001)

2000
R. F. Feng, Q. Ji,L. F. Zhu, Q. C. Shi, X .J. Zhang, S. L. Wu, Z. P. Zhong, K. Z. Xu, Electron-impact study for optical oscillator strengths and elastic scattering cross sections of mercury vapor, J. Phys. B 33(7), 1357-1367(2000)

1999
L. F. Zhu, Z. P. Zhong, X. J. Liu, R. F. Feng, X. J. Zhang and K. Z. Xu, Absolute generalized oscillator strength distributions for the continuum region of helium, J. Phys. B 32, 4897-4903(1999)

X. J. Zhang,L. F. Zhu, Y. X. Wang, X. J. Liu, R. F. Feng, K. Z. Xu, Z. P. Zhong and J. Yan, Optical oscillator strengths for 32S?42P and 32S?52P excitations of Na, Chin. Phys. Lett., 16, 882(1999)

1998
Z. P. Zhong, K. Z. Xu, R. F. Feng, X. J. Zhang, L. F. Zhu，X. J. Liu, Optical oscillator strengths and angular variation of intensity distributions within the Lyman and Werner bands of molecular hydrogen, J. Electro. Spec. Relat. Phenom., 94, 127 (1998)

1997
X. J. Zhang, R. F. Feng, Z. P. Zhong, Q. Ji, L. F. Zhu, S. L. Wu, and K. Z. Xu High-resolution dipole (e, e) study for optical oscillator strengths of valence shell excitation of nitrogen , Chin. Sci. Bulletin, 42, 1426(1997)

Z. P. Zhong, R. F. Feng, S. L. Wu, L. F. Zhu, X. J. Zhang and K. Z. Xu, Electron-impact study for the 31S and n1P(n=3-6) levels in helium, J. Phys. B30, 5305 (1997)

Z. P. Zhong, R. F. Feng, K. Z. Xu, S. L. Wu, L. F. Zhu, X. J. Zhang and Q. Ji, Absolute generalized oscillator strengths for the vibronic bands of A1Π, B1Σ+, C1Σ+ and E1Π transitions of carbon monoxide, Phys. Rev. A 55, 1799-1809 (1997)

1996
Q. Ji, S. L. Wu, R. F. Feng, X. J. Zhang,L. F. Zhu, Z. P. Zhong, K. Z. Xu and Y. Zheng, Absolute generalized oscillator strengths of 4s,4s,4p+4p excitations of argon determined by the angle-resolved electron energy-loss spectrometer, Phys. Rev. A 54, 2786 (1996)