The photoionization‐efficiency curve of ethylene has been shown to have vibrational structure at the threshold for production of the first excited state of the parent ion. Autoionization of superexcited states in this region does not occur significantly. Appearance potentials were measured for the fragment ions C2H3+, C2H2+, and CH2+. The thermochemical values obtained were .
REFERENCES
1.
R.
Botter
, V. H.
Dibeler
, J. A.
Walker
, and H. M.
Rosenstock
, J. Chem. Phys.
45
, 1298
(1966
).2.
3.
4.
5.
6.
7.
8.
J. Person (private communication).
9.
M. I. Al‐Joboury and D. W. Turner, J. Chem. Soc. 1964, 4434.
10.
G. Herzberg, Electronic Spectra of Polyatomic Molecules (D. Van Nostrand Co., Inc., Princeton, N.J., 1966), pp. 533–535 and references therein.
11.
12.
G. R. Cook and B. K. Ching, “Absorption, Photoionization, and Fluorescence of Some Gases of Importance in the Study of the Upper Atmosphere,” Rept. No. TDR‐469 (9260‐01)‐4, Aerospace Corporation, El Segundo, Calif., 30 January 1965.
13.
See Ref. 10, pp. 348, 394.
14.
15.
16.
17.
18.
F. D. Rossini, D. D. Wagman, W. H. Evans, W. H. Levine, and I. Jaffe, Natl. Bur. Std. (U.S.) Circ. No. 500 (1952).
19.
This content is only available via PDF.
© 1969 American Institute of Physics.
1969
American Institute of Physics
You do not currently have access to this content.
