Broadband photon yield of Kr excited by monoenergetic electron impact above the ionization threshold. Part I: 22–26 eV

1982 ◽  
Vol 60 (6) ◽  
pp. 855-864 ◽  
Author(s):  
M. Boulay ◽  
P. Marchand
Keyword(s):  
Electron Impact ◽  
Energy Region ◽  
Ionization Threshold ◽  
Negative Ion ◽  
Photon Yield ◽  
Monoenergetic Electron

The broadband photon yield of Kr excited by monoenergetic electron impact above the ionization threshold has been measured by means of an improved apparatus. Results are given for the energy region 22–26 eV. The observed structures are interpreted as being due to highly excited neutral states and to highly excited negative-ion states.

Broadband photon yield of Kr excited by monoenergetic electron impact. Part II: 12–15 eV

1982 ◽  
Vol 60 (12) ◽  
pp. 1775-1782
Author(s):  
P. Marchand
Keyword(s):  
Electron Impact ◽  
Spectral Range ◽  
Observation Point ◽  
Ionization Threshold ◽  
Negative Ion ◽  
Photon Yield ◽  
Monoenergetic Electron

The broadband photon yield in the spectral range 165–650 nm of Kr excited by monoenergetic electrons with energies from 12 to 15 eV has been measured. Several negative-ion states are observed both below and above the 2P3/2 ionization threshold. No structures are detected above the 2P1/2 limit, even with a total accumulation of 200 million counts per observation point.

Metastable yield of argon between 23 and 37 eV by electron impact

1979 ◽  
Vol 57 (10) ◽  
pp. 1624-1633 ◽  
Author(s):  
P. Marchand ◽  
J. Cardinal
Keyword(s):  
Electron Impact ◽  
Excited States ◽  
Signal To Noise Ratio ◽  
Negative Ion ◽  
Photon Yield ◽  
Large Signal ◽  
Signal To Noise ◽  
Monoenergetic Electron ◽  
Yield Curves ◽  
Noise Ratio

The metastable yield of argon excited by monoenergetic electron impact has been measured between 23 and 37 eV. Thanks to a large signal-to-noise ratio, many very small structures have been detected superimposed on the metastable continuum and are attributed to Ar− negative-ion states and to highly excited states of Ar. The results are compared with broadband photon yield curves and electroionization curves.

Structures observées dans la courbe d'émission photonique de N2 entre 11.00 et 15.50 eV

1977 ◽  
Vol 55 (24) ◽  
pp. 2134-2141 ◽  
Author(s):  
Paul Veillette ◽  
Pierre Marchand
Keyword(s):  
Electron Impact ◽  
Electron Energy ◽  
Incident Electron ◽  
Ionization Threshold ◽  
Negative Ion ◽  
Incident Electron Energy ◽  
Photon Yield

The measurement of the broadband photon yield of N2 molecules excited by electron impact, as a function of the incident electron energy, shows many structures below the ionization threshold. Most of them are due to the formation of negative ion resonances N2−.

High-resolution photon yield of xenon by monoenergetic electron impact

1987 ◽  
Vol 65 (5) ◽  
pp. 510-517
Author(s):  
René Le ◽  
Pierre Marchand
Keyword(s):  
High Resolution ◽  
Electron Impact ◽  
Excited States ◽  
Broad Band ◽  
Electron Excitation ◽  
Negative Ion ◽  
Photon Yield ◽  
Monoenergetic Electron

The broad-band (165–650 nm) photon yield of xenon by monoenergetic electron excitation has been measured in the range from 10.9 eV to above 13.436 eV (2P1/2 limit). Neutral excited states and several new negative-ion states are detected. Interpretation and classification are discussed.

THE IONIZATION AND DISSOCIATION OF SOME HALOGEN MOLECULES BY ELECTRON IMPACT

1960 ◽  
Vol 38 (3) ◽  
pp. 407-420 ◽  
Author(s):  
D. C. Frost ◽  
C. A. McDowell
Keyword(s):  
Electron Impact ◽  
Excited States ◽  
Electronic Structures ◽  
Negative Ions ◽  
Molecular Ions ◽  
Negative Ion ◽  
Iodine Monochloride ◽  
Monoenergetic Electron ◽  
Iodine Monobromide ◽  
Ionization Processes

The ionization and dissociation of chlorine, bromine, iodine, iodine monochloride, and iodine monobromide by electron impact have been studied in a mass spectrometer which uses a monoenergetic electron source. Many ionization potentials have been observed for these molecules which, of course, refer to the formation of the parent molecular ions in different excited states. These experimental results are discussed in terms of simple molecular orbital theories of the electronic structures of the different halogen molecules.Electron-induced dissociative ionization processes for the different substances have also been studied. Where possible, appearance potentials of both the positive and negative ions have been determined. These results have been used to construct potential energy diagrams illustrating the origin of some of the negative ion and dissociation processes observed.

Excitation par impact électronique des états 3s3p6nl de l'argon

1974 ◽  
Vol 52 (11) ◽  
pp. 930-934 ◽  
Author(s):  
Paul Veillette ◽  
Pierre Marchand
Keyword(s):  
Electron Impact ◽  
Electron Energy ◽  
Emission Intensity ◽  
Photon Emission ◽  
Negative Ion ◽  
Monoenergetic Electron

In the measurement of the photon emission intensity of argon excited by monoenergetic electron impact, as a function of the electron energy, several structures are detected between 24 and 28 eV. They can be attributed to excitation levels of the form 3s3p6nl and to negative ion resonances.

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