The decomposition pressure of the anhydrous normal sulfate reaches one atmosphere at about 810°.3. Ph measurements of indium sulfate solutions show that a considerable degree of hydrolysis occurs.
The investigations begun in the neighborhood of the (0',1") band at X3428 (cf. reference 4) have been extended to include the bands of the (0,0) and (l',0") sequences. Approximately 400 lines were observed in this region of the spectrum, of which 120 are reported for the first time. All but 18 of these have been successfully assigned. The assignments include the identification of a new (2,2) band with its principal head at A3185; the identification of RR R2i and of pp Pi2 satellite r branches of the (1,1) band; complete assignments of the regular i?-branches of the (1,1) and(2',1") bands; and extensions of nearly all the remaining branches of the bands which appear in this region. The new data are also utilized to obtain A-doublets and spin doublets to K = 35 for the 0" level and to somewhat smaller values of K for the 1" and 2" levels. The experimental results are compared with equations in the literature. Molecular constants derived from the new (2,2) band are in good agreement with those derived from the {V,2") band.
Identification of the (2, 2) Band of Neutral OH. Satellite Series of the (1,1) Band. Extensions of the (0, 0) BandAnalysis of some plates which we have obtained with very intense exposures of the ultraviolet "water vapor" bands, due to neutral OH, permit us to make approximately 150 new assignments of lines in the band sequence in the neighborhood of X3064. Among these are about 75 lines which form the six principal branches of the (2, 2) band with its principal head at about X3185. This brings the number of bands which have been identified in the OH system to a total of eight. The assignments are confirmed by application of the combination principle, both with respect to the upper level, by comparison with the (A.F')'s of the (2', 0") and (2', 1") bands, and with respect to the lower level by comparison with the (AF'O's of the (1', 2") band, recently identified by Johnston, Dawson and Walker. 1 Rotational and vibrational constants derived for the new (2, 2) band are in good agreement with the values derived from the (1', 2") band.The remaining lines (approximately 75 in number) in-clude the RR R n and the PF Pu satellite series of X3122, which have, heretofore, been unobserved, as well as extensions of the principal R series of both X3122 and X3064 and of the satellite series of X3064. We also confirm Shaw's recent measurements 2 of 63 new assignments in the principal Q and P branches of XX3064 and 3122. A more complete description of the work will be submitted to this journal.
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