Abstract
The absorption spectrum of yttrium vapour has been photographed in the spectral range 1650 to 2250 À, with a 10 m spectrograph. Series of autoionization resonances, which converge on excited states of the Y
+
ion have been identified, as combinations with the doublet ground-state of Y
I
, 5s
2
4d
2
D
3/2
,
5/2
. Although the lines of these series show broadened and often asymmetrical profiles, the lines are sufficiently well defined to fix a value for the first ionization potential of Y
I
, which differs from the previously accepted value by approximately 2500 cm
-1
. In addition, approximately 400 new Y
I
lines, which involve excited levels below the first ionization limit of Y
I
, namely 4s
2
1
S
o
, have been found. The majority of these are unclassifiable at present but, the value for the first ionization-potential being known from the resonances above-mentioned, two series of the character 5s
2
4d
2
D
3/2
,
5/2
-5s
2
nf
2
F
o
have been identified. In addition to the identifications of series, 152 new lines below the 5s
2
1
S
o
limit identify 76 new levels of Y
I
, of odd parity.
Reference5 articles.
1. B o v e y L. F . H . 1955 Proc. P hys.
2. C atalan M. A . & R ico 1952
3. P hys;F;Rev.,1961
4. P hys;F;Rev. 137, A 1364. Soc.(A),1965
5. A n .Real Soc. Esp(A) 48 328.
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