ELECTRON-IMPACT EXCITATION OF 11S-]21P AND 11S-]31P OF HELIUM - EXCITATION CROSS-SECTIONS AND POLARIZATION FRACTIONS OBTAINED FROM XUV-RADIATION

被引：58
作者：
WESTERVELD, WB
HEIDEMAN, HGM
VANECK, J
机构：
[1] Fysisch Laboratorium Rijksuniversiteit, Utrecht
来源：
JOURNAL OF PHYSICS B-ATOMIC MOLECULAR AND OPTICAL PHYSICS | 1979年 / 12卷 / 01期
关键词：
D O I：
10.1088/0022-3700/12/1/019
中图分类号：
O43 [光学];
学科分类号：
070207 ; 0803 ;
摘要：
The excitation of the 21P and 31P states of helium by electrons has been studied in the energy range from near threshold to 2 keV. This was done by observing the XUV radiation produced at emission angles of 55 degrees C and 90 degrees C to the incident electron beam. Fano plots of the relative data were fitted by straight lines in the high-energy region. The measurements were brought on an absolute scale by normalising the 'relative' slopes of the fits to the slopes predicted by the Bethe approximation. For energies exceeding 350 eV the total cross sections are in agreement with the Bethe approximation. In the lower energy region (30-300 eV) the total cross sections are in good agreement with recent distorted-wave calculations. By combining the results obtained at 55 degrees C and at 90 degrees C to the electron beam, total cross sections from excitation of the magnetic sublevels were obtained. Polarisation fractions were derived from the experimental results in the energy range 30-300 eV.
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页码：115 / 135
页数：21
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共 51 条
[1]   THEORETICAL STUDY OF FAST ELECTRON-HELIUM SCATTERING [J].
BAYE, D ;
HEENEN, PH .
JOURNAL OF PHYSICS B-ATOMIC MOLECULAR AND OPTICAL PHYSICS, 1974, 7 (08) :938-949
[2]   ACCURATE FIRST BORN APPROXIMATION CROSS SECTIONS FOR EXCITATION OF HELIUM BY FAST ELECTRONS [J].
BELL, KL ;
KENNEDY, DJ ;
KINGSTON, AE .
JOURNAL OF PHYSICS PART B ATOMIC AND MOLECULAR PHYSICS, 1969, 2 (01) :26-&
[3]   USE OF SECOND-ORDER POTENTIALS IN THEORY OF SCATTERING OF CHARGED-PARTICLES BY ATOMS .4. ELECTRON-SCATTERING OF HELIUM-ATOMS [J].
BERRINGTON, KA ;
BRANSDEN, BH ;
COLEMAN, JP .
JOURNAL OF PHYSICS B-ATOMIC MOLECULAR AND OPTICAL PHYSICS, 1973, 6 (03) :436-449
[4]   USE OF SECOND-ORDER POTENTIALS IN THEORY OF SCATTERING OF CHARGED-PARTICLES BY ATOMS .8. EXCITATION OF N = 3 LEVELS OF HELIUM BY ELECTRON AND PROTON IMPACT [J].
BRANSDEN, BH ;
ISSA, MR .
JOURNAL OF PHYSICS B-ATOMIC MOLECULAR AND OPTICAL PHYSICS, 1975, 8 (07) :1088-1094
[5]   NEAR-THRESHOLD ELECTRON-IMPACT EXCITATION OF ULTRAVIOLET-EMITTING LEVELS OF HELIUM-ATOMS [J].
BRUNT, JNH ;
KING, GC ;
READ, FH .
JOURNAL OF ELECTRON SPECTROSCOPY AND RELATED PHENOMENA, 1977, 12 (03) :221-228
[6]   ABSOLUTE MEASUREMENT OF DIFFERENTIAL CROSS SECTIONS FOR ELECTRON SCATTERING IN HELIUM [J].
CHAMBERLAIN, GE ;
MIELCZAREK, SR ;
KUYATT, CE .
PHYSICAL REVIEW A-GENERAL PHYSICS, 1970, 2 (05) :1905-+
[7]   INELASTIC SCATTERING OF ELECTRONS BY HELIUM [J].
CHAMBERLAIN, GE ;
HEIDEMAN, HG .
PHYSICAL REVIEW LETTERS, 1965, 15 (08) :337-+
[8]   GLAUBER CROSS-SECTIONS FOR EXCITATION OF 2 P-1 STATE OF HELIUM BY ELECTRON-IMPACT [J].
CHAN, FT ;
CHEN, ST .
PHYSICAL REVIEW A, 1974, 9 (06) :2393-2397
[9]   EXCITATION CROSS-SECTIONS OF E-+HE-]E-+HE(3P-1,4P-1) AND POLARIZATION OF 5016-A HELIUM LINE RESULTING FROM E--HE SCATTERING IN GLAUBER THEORY [J].
CHAN, FT ;
CHEN, ST .
PHYSICAL REVIEW A, 1974, 10 (04) :1151-1156
[10]   EXPERIMENTAL AND (FIRST-ORDER MANY-BODY) THEORETICAL DIFFERENTIAL AND INTEGRAL CROSS-SECTIONS FOR EXCITATION OF N=3 STATES OF HE BY ELECTRON-IMPACT AT 29.2 AND 39.7 EV [J].
CHUTJIAN, A ;
THOMAS, LD .
PHYSICAL REVIEW A, 1975, 11 (05) :1583-1595
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