Dissociative excitation of H2: Spectral line shapes and electron impact cross sections of the Balmer lines

1976 ◽  
Vol 64 (3) ◽  
pp. 1122-1127 ◽  
Author(s):  
Robert S. Freund ◽  
James A. Schiavone ◽  
Donna F. Brader
Keyword(s):  
Spectral Line ◽  
Electron Impact ◽  
Cross Sections ◽  
Dissociative Excitation ◽  
Line Shapes ◽  
Balmer Lines

Intensity Ratios within the Balmer Lines Hα and Hβ After Dissociative Excitation of C6H6 and H2

1976 ◽  
Vol 31 (11) ◽  
pp. 1292-1297 ◽  
Author(s):  
H. J. Hartfuß ◽  
J. Neumann ◽  
H. D. Schneider
Keyword(s):  
Electron Impact ◽  
Cross Sections ◽  
Principal Quantum Number ◽  
Dissociative Excitation ◽  
Total Emission ◽  
Excitation Cross Sections ◽  
Balmer Lines ◽  
State Production ◽  
Intensity Ratios ◽  
Dissocia Tion

Abstract The decay-curves of the Balmer-lines Hα and Hβ have been measured after dissociative excitation of C6H6 and H2 by electron-impact in the 100 eV range. The analysis of the decay-curves shows, in agreement with other authors, that only the 3s-and 3d-states in the case of Hα and the 4s-and 4d-states in the case of Hβ contribute significantly to the total intensity of Hα and Hβ, respectively, but not the p-states 3p and 4p. The intensity-ratios J(3s)/J(Ha) and J(4s)/J(Hβ) have been investigated. Comparison with the total emission cross-sections of the states n=3 and n=4 allows to determine the excitation cross-sections of the sublevels 3s and 4s. It is found that s-state production is favoured in the dissocia-tion process. This seems to be independent on the principal quantum number.

Dissociative excitation of CH4 by electron impact: Emission cross sections for the fragment species

1996 ◽  
Vol 213 (1-3) ◽  
pp. 369-384 ◽  
Author(s):  
K. Motohashi ◽  
H. Soshi ◽  
M. Ukai ◽  
S. Tsurubuchi
Keyword(s):  
Electron Impact ◽  
Cross Sections ◽  
Dissociative Excitation

Dissociative excitation of CF4 by controlled electron impact

1989 ◽  
Vol 67 (7) ◽  
pp. 699-705 ◽  
Author(s):  
S. Wang ◽  
J. L. Forand ◽  
J. W. McConkey
Keyword(s):  
Energy Range ◽  
Emission Spectrum ◽  
Electron Impact ◽  
Cross Sections ◽  
Incident Energy ◽  
Dissociative Excitation ◽  
Excitation Mechanism ◽  
Excitation Functions ◽  
Single Collision

Dissociative excitation of CF4 by electron impact has been studied under single-collision conditions for incident energies up to 600 eV. The emission spectrum in the range 50–130 nm shows many features arising from neutral and singly ionized fluorine and carbon fragments. Absolute cross sections for the observed features were measured at 200 eV incident energy, while the excitation functions of the most intense emissions were studied over the whole energy range. Cascade was shown to be the dominant excitation mechanism for some of these features.

Measurement of absolute electron-impact excitation cross sections in Ar and N2 using H and H2 emissions as secondary standards

1988 ◽  
Vol 66 (4) ◽  
pp. 349-357 ◽  
Author(s):  
J. L. Forand ◽  
S. Wang ◽  
J. M. Woolsey ◽  
J. W. McConkey
Keyword(s):  
Electron Impact ◽  
Cross Section ◽  
Cross Sections ◽  
Emission Cross Section ◽  
Impact Excitation ◽  
Electron Impact Excitation ◽  
Dissociative Excitation ◽  
Excitation Cross Sections ◽  
Line Following ◽  
Good Agreement

A detailed description is given of a technique in which emissions from H and H2 are used to calibrate an apparatus used for electron-impact emission cross-section measurements in the wavelength range 90–130 nm. Absolute emission cross sections have been measured at 200 eV electron-impact energy for the 120 nm N I line following dissociative excitation of N2 and for the Ar and Ar+ lines at 104.8, 106.7, 92.0, and 93.8 nm respectively. Good agreement with earlier works is obtained in the case of the N I line when earlier data are renormalized to take into account the recent revision of the cross section for production of Lyman α from H2. Measurements of the 104.8 and 106.7 nm lines suggest a 40% cascade component for the latter line at energies of 200 eV and above.

Dissociative excitation of SF6 by controlled electron impact

1986 ◽  
Vol 64 (3) ◽  
pp. 269-276 ◽  
Author(s):  
J. L. Forand ◽  
K. Becker ◽  
J. W. McConkey
Keyword(s):  
Emission Spectrum ◽  
Electron Impact ◽  
Spectral Range ◽  
Cross Sections ◽  
Dissociative Excitation ◽  
Excitation Functions ◽  
Single Collision

Dissociative excitation of SF6 by electron impact has been studied under single-collision conditions for incident energies up to 600 eV. The emission spectrum in the spectral range 450–1850 Å shows many features arising from neutral and singly ionized fluorine and sulphur fragments. Absolute cross sections for many of the emissions were measured, and excitation functions and appearance potentials were determined for selected features from each of the four systems. The largest cross sections were found for the FI transitions at 955 Å (2.3 × 10−18 cm2) and 975 Å (1.7 × 10−18 cm2).

scholarly journals Working Group 3: Collision Cross Sections and Line Broadening

1985 ◽  
Vol 19 (1) ◽  
pp. 139-148
Author(s):  
S. Sahal-Brechot
Keyword(s):  
Spectral Line ◽  
Cross Sections ◽  
Working Group ◽  
Great Part ◽  
General State ◽  
Line Broadening ◽  
Line Shapes ◽  
Actual Content ◽  
Group 3 ◽  
The Subject

The proceedings of the 6th and 7th International Conference on Spectral Line Shapes shown the general state of advances of the subject. Though a great part of the actual content lies outside the present interest, a number of useful results for astrophysical purposes can be found therein and will be quoted hereafter.

Dissociative excitation of SiH4 by electron impact: Emission cross sections for the hydrogen Lyman series

1991 ◽  
Vol 155 (3) ◽  
pp. 401-406 ◽  
Author(s):  
S. Tsurubuchi ◽  
K. Motohashi ◽  
S. Matsuoka ◽  
T. Arikawa
Keyword(s):  
Electron Impact ◽  
Cross Sections ◽  
Dissociative Excitation
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