Recent advances in the chemistry of electronically excited atoms

1970 ◽  
Vol 70 (4) ◽  
pp. 489-516 ◽  
Author(s):  
Robert J. Donovan ◽  
David. Husain
Keyword(s):  
Excited Atoms ◽  
Recent Advances ◽  
Electronically Excited

Excited-Atom Production by Electron Bombardment of Alkali-Halides

1986 ◽  
Vol 75 ◽  
Author(s):  
R. E. Walkup ◽  
Ph. Avouris ◽  
A. P. Ghosh
Keyword(s):  
Gas Phase ◽  
Excited States ◽  
Ground State ◽  
Excited Atom ◽  
Alkali Halides ◽  
Electron Bombardment ◽  
Secondary Electrons ◽  
Excited Atoms ◽  
Positive Ions ◽  
Electronically Excited

AbstractWe present experimental results which suggest a new mechanism for the production of excited atoms and ions by electron bombardment of alkali-halides. Doppler shift measurements show that the electronically excited atoms have a thermal velocity distribution in equilibrium with the surface temperature. Measurements of the absolute yield of excited atoms, the distribution of population among the excited states, and the dependence of yield on incident electron current support a model in which excited atoms are produced by gas-phase collisions between desorbed ground-state atoms and secondary electrons. Similarly, gas-phase ionization of ground-state neutrals by secondary electrons accounts for a substantial portion of the positive ions produced by electron bombardment of alkali-halides.

The collisional quenching of electronically excited oxygen atoms, O(21D2), by the gases NH3, H2O2, C2H6, C3H8, and C(CH3)4, using time-resolved attenuation of atomic resonance radiation

1976 ◽  
Vol 54 (11) ◽  
pp. 1765-1770 ◽  
Author(s):  
I. S. Fletcher ◽  
D. Husain
Keyword(s):  
Resonance Radiation ◽  
Recent Measurement ◽  
Absolute Rate ◽  
Collisional Quenching ◽  
Time Resolved ◽  
Excited Atoms ◽  
Electronically Excited ◽  
Hartley Band ◽  
Excited Oxygen ◽  
Oxygen Atoms

A kinetic study of electronically excited oxygen atoms, O(21D2), is presented. These optically metastable species were generated by repetitive pulsed irradiation in the Hartley-band continuum and monitored photoelectrically in absorption by time-resolved attenuation of resonance radiation at λ = 115.2 nm (O(31D20)←O(21D2). Absolute rate constants for the collisional quenching of O(21D2) are reported for the gases NH3, H2O2, C2H6 C3H8, and C(CH3)4. These are found to be respectively (in units of 10−10 cm3 molecule−1 S−1 at 300 K), 6.3 ± 0.7, 5.2 ± 0.6, 7.3 ± 0.8, 9.5 ± 1.0, and 12.3 ± 1.3. With the exception of a recent measurement for NH3• these data represent the first absolute measurements for these quenching gases. Further, a general comparison is made between absolute rate measurements using this technique and recent work by Schiff and co-workers using time-resolved emission at λ = 630 nm (O(21D2) → O(23P2)) in order to monitor the excited atoms.

Production of electronically excited atoms. II. H + HI->H2 + I*(2P1/2)

1968 ◽  
Vol 72 (11) ◽  
pp. 3715-3721 ◽  
Author(s):  
Philip Cadman ◽  
John C. Polanyi
Keyword(s):  
Excited Atoms ◽  
Electronically Excited
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