Dissociative excitation of HD +, D 2+, and DT + by electron impact

Open Physics ◽  
2010 ◽  
Vol 8 (1) ◽  
Author(s):  
Mariana Duca ◽  
Magda Fifirig
Keyword(s):  
Electron Impact ◽  
Cross Sections ◽  
Theoretical Study ◽  
Electronic States ◽  
Dissociative Excitation ◽  
Molecular Electronic ◽  
Excitation Cross Sections ◽  
Quantum Defect Theory ◽  
K Matrix ◽  
Diabatic Representation

AbstractIn the framework of the Multi-Channel Quantum Defect Theory (MQDT), a theoretical study of the dissociative excitation is presented. Numerical results for the dissociative excitation cross sections of HD +, D 2+, and DT + with electrons of energy between 2 and 12 eV are reported. The contribution of the vibrational continua of the two lowest electronic states as explicit ionization channels has been considered. Within a quasi-diabatic representation of the molecular electronic states, the Born expansion of second order is done in the K-matrix evaluation.

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.

scholarly journals Electron-impact dissociative excitation cross sections for singlet states of molecular hydrogen

2018 ◽  
Vol 98 (3) ◽  
Author(s):  
Jonathan K. Tapley ◽  
Liam H. Scarlett ◽  
Jeremy S. Savage ◽  
Dmitry V. Fursa ◽  
Mark C. Zammit ◽  
...  
Keyword(s):  
Electron Impact ◽  
Cross Sections ◽  
Molecular Hydrogen ◽  
Dissociative Excitation ◽  
Singlet States ◽  
Excitation Cross Sections

Effective Oscillator Strengths of Neon from Electron Impact Excitation

1975 ◽  
Vol 53 (9) ◽  
pp. 850-853 ◽  
Author(s):  
D. Roy ◽  
J.-D. Carette
Keyword(s):  
Experimental Data ◽  
Electron Impact ◽  
Cross Sections ◽  
Electronic States ◽  
Oscillator Strengths ◽  
Impact Excitation ◽  
Electron Impact Excitation ◽  
Excitation Cross Sections ◽  
Relative Excitation ◽  
Good Agreement

From experimental data about relative excitation cross sections of many electronic states of neon, the effective oscillator strengths of these transitions have been computed. There is a good agreement between these results and the single available value of optical oscillator strength.

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.

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