Four ionization potentials for the CS2 molecule, three for the COS, and three for the N2O were determined by an analysis of Rydberg series of the respective molecules. Our value for the first ionization potential of CS2 agrees very well with the previous spectroscopically determined value; however, there was disagreement between our value for the first ionization potential of N2O and that determined previously.

Several progressions of absorption bands for each of the molecules were also observed.

1.
W. C.
Price
and
D. M.
Simpson
,
Proc. Roy. Soc. (London)
A165
,
272
(
1938
).
2.
A. B. F.
Duncan
,
J. Chem. Phys.
4
,
638
(
1936
).
3.
Y.
Tanaka
,
A. S.
Jursa
, and
F. J.
LeBlanc
,
J. Chem. Phys.
32
,
1199
(
1960
), this issue.
4.
The conversion factor which we used differs from theirs. Their original values for the series limits expressed in ev are 10.083 and 10.027 ev.
5.
Actually, the two values coincided accidentally (see Table I).
6.
This band of CO2 belongs to the Rydberg series which converges to the first ionization potential, while the 1117 A band of CS2 belongs to the series converging to the second ionization potential.
7.
K. Watanabe, M. Zelikoff, and E. C. Y. Inn, AFCRC Technical Report No. 53–23, Geophysical Research Papers, No. 21, June, 1953.
8.
See section entitled “Apparent Emission Series” in footnote 3.
9.
The n = 3 band, particularly, was very strong and diffuse even at low pressure.
10.
No measurement was made for these bands. They are very weak and are observed only at high pressure.
11.
K.
Watanabe
,
J. Chem. Phys.
26
,
542
(
1957
).
12.
The continuum is the n = 3 member of his Rydberg series.
13.
M.
Zelikoff
,
K.
Watanabe
, and
E. C. Y.
Inn
,
J. Chem. Phys.
21
,
1643
(
1953
).
14.
This continuum is the n = 4 of his Rydberg series.
15.
They were not identified mainly because of experimental difficulty. The He continuum is extremely weak in this region, while the A continuum is extremely strong. Actually, in the latter case, this region was covered by the broadened portion of the resonance line, 1066.6 A.
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