The electron affinity of iodine atoms has been determined by a direct method in which only iodine atoms and electrons were involved. The value so obtained is 74.6 k‐calories, which is in good agreement with values obtained by other methods. The concentration of the several ions of different masses (I and E) have been calculated from their effect on space charge. It has been established that iodine has no effect on the thermionic emission of tungsten.

1.
Presented at the New York Meeting of the A.C.S. April, 1935.
2.
This article is based upon a thesis presented to the Faculty of the Graduate School of the University of Minnesota by Melvin Calvin in partial fulfilment of the requirements for the degree of Doctor of Philosophy.
3.
O.
Oldenberg
,
Phys. Rev.
43
,
534
(
1933
). This paper contains further references.
4.
Geo.
Glockler
,
Phys. Rev.
45
,
111
(
1934
).
5.
Sutton
and
Mayer
,
J. Chem. Phys.
3
,
20
(
1935
).
6.
Langmuir
,
Phys. Rev.
43
,
226
(
1933
).
7.
O. W. Richardson, Emission of Electricity from Hot Bodies (Longmans, Green & Co., London, 1921).
8.
Langmuir
and
Compton
,
Rev. Mod. Phys.
3
,
191
(
1931
);
and
Langmuir
,
Phys. Rev.
2
,
450
(
1913
).
9.
Heinze
,
Ann. d Physik
16
,
41
(
1933
).
10.
Langmuir
and
Jones
,
Gen. Elec. Rev.
30
,
310
9
(
1927
).
11.
Van Pragh, J. Chem. Soc. 798 (1933).
12.
Van Pragh
and
Rideal
,
Proc. Roy. Soc.
A134
,
385
(
1931
), and reference 5.
13.
Hogness
and
Harkness
,
Phys. Rev.
32
,
784
(
1928
).
14.
Stark
and
Bodenstein
,
Zeits. f. Elecktrochemie
16
,
961
(
1910
).
15.
Van Pragh
and
Rideal
,
Proc. Roy. Soc.
A134
,
385
(
1931
).
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