The total absorption cross section and photoionization yield of molecular iodine were measured from 1050 to 2200 Å. Two thresholds were observed in the photoionization yield curve. The first was associated with the ion‐pair production I+ + I and the second to direct ionization of I2. From the appearance potential for ion‐pair production and the accurate ionization potential of I2 it was possible to calculate the value of the electron affinity of iodine, namely, 3.073 ± 0.014 eV.

1.
R. S.
Mulliken
,
Phys. Rev.
46
,
549
(
1934
).
2.
R. S.
Mulliken
,
Phys. Rev.
57
,
500
(
1940
).
3.
K.
Wieland
and
J.
Waser
,
Nature
160
,
643
(
1947
).
4.
L.
Mathieson
and
A. L. G.
Rees
,
J. Chem. Phys.
25
,
753
(
1966
).
5.
H.
Cordes
,
Z. Physik
97
,
603
(
1935
).
6.
O.
Oldenberg
,
Z. Physik
18
,
1
(
1923
).
7.
A.
Nobs
and
K.
Wieland
,
Helv. Phys. Acta.
39
,
564
(
1966
).
8.
R. D.
Verma
,
J. Chem. Phys.
32
,
738
(
1960
).
9.
M. Kimura and K. Tonomura, Pieter Zeeman (Martinus Nijhoff, The Hague, Netherlands, 1935), p. 241.
10.
P.
Venkateswarlu
,
Proc. Indian Acad. Sci.
A24
,
473
(
1946
).
11.
P. B. V.
Haranath
and
P. T.
Rao
,
J. Mol. Spectry.
2
,
428
(
1958
).
12.
P.
Venkateswarlu
,
Bull. Am. Phys. Soc.
14
,
622
(
1969
).
13.
R. T.
Brackmann
,
W. L.
Fite
, and
K. E.
Hagen
,
Rev. Sci. Instr.
29
,
125
(
1958
).
14.
W. E.
Kaupilla
,
W. R.
Ott
, and
W. L.
Fite
,
Rev. Sci. Instr.
38
,
811
(
1967
).
15.
J. A.
Myer
and
J. A. R.
Samson
,
J. Chem. Phys.
52
,
266
(
1970
).
16.
J. A. R. Samson, Techniques of Vacuum Ultraviolet Spectroscopy (John Wiley & Sons, Inc., New York, 1967).
17.
K.
Watanabe
,
F. M.
Matsunaga
, and
H.
Sakai
,
Appl. Opt.
6
,
391
(
1967
).
18.
G. Herzberg, Spectra of Diatomic Molecules (D. Van Nostrand Co., Inc., Princeton, N.J., 1950).
19.
D. C.
Frost
,
C. A.
McDowell
, and
D. A.
Vroom
,
J. Chem. Phys.
46
,
4255
(
1967
).
20.
J. D.
Morrison
,
H.
Hurzeler
,
M. G.
Inghram
, and
H. E.
Stanton
,
J. Chem. Phys.
33
,
821
(
1960
).
21.
K.
Watanabe
,
J. Chem. Phys.
26
,
542
(
1957
).
22.
R. E.
Huffman
,
J. C.
Larrabee
, and
Y.
Tanaka
,
J. Chem. Phys.
47
,
856
(
1967
).
23.
R. S.
Berry
,
C. W.
Riemann
, and
G. N.
Spokes
,
J. Chem. Phys.
37
,
2278
(
1962
).
24.
B.
Steiner
,
M. L.
Seman
, and
L. M.
Branscomb
,
J. Chem. Phys.
37
,
1200
(
1962
).
25.
A. N. Nesmeyanov, Vapor Pressure of the Elements (Academic Press Inc., New York, 1963), p. 466.
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