Energy Intensity Energy Intensity 3.15 Mev 9.5 to 20% 2.51 26% 2.52 Mev 8 to 18.5% 2.21 31.5% 0.955 Mev 32% 1.87 7.5% 0.64 Mev 40% (1.60) (4.5%) 1.05 4.5% 0.84 100% 0.68 2% 0.63 18.5% 1.87-Mev line fits well between the levels of Ge 72 at 3.35 Mev and 1.47 Mev, while the sum of the other three lines, 0.68+1.05-fl.60~3.33, is very close to the difference between the 3.35-Mev level of Ge 72 and the ground state.However, the intensity of the 0.68 line appears to be much too small to be in a sequence with the L05-Mev line and probably the 1.60-Mev line, even allowing for rather large uncertainty in intensity measurements. The 0.68 line was found by means of its conversion electrons which appear in about 0.5 percent of the disintegrations. The gamma-ray line intensity is so small as to be very difficult to measure. It would appear, however, that the conversion coefficient was between 10 and 50 percent which, for such a high energy and such a low atomic number, would indicate a metastable level with a considerable half-life. The decay period of the beta-ray spectrum and conversion line differs inappreciably from 14.1 hours, indicating that the delay of the line is not longer than a few hours at most.

No abstract

The infrared transmission of the plastic polyvinylidene fluoride has been measured. Normal and thermally decomposed samples were used. Bands yielding information on phase transitions and behavior during pyrolytic decomposition have been observed. The mechanism of thermal degradation is briefly discussed. Absorption coefficients of important bands have been evaluated.

The vibrational infrared absorption spectra of the molecules CSe2, SCSe, and SCTe have been recorded and analyzed. Some Raman data are also reported. The fundamental frequencies (in em-I) of these molecules, UI (symmetric stretching), U2 (bending), and U3 (asymmetric stretching) are, respectively: CSe2 (gas) 368,308, and 1303; CSe2 (liquid) 368, 310, and 1267; SCSe (g) 506,355, and 1435; SCSe (I) 502,350, and 1408; SCTe (CS 2 solution) 423, 337, and 1347. Observed isotopic shifts due to CI3 in all three compounds are reported and discussed. The expected linearity of CSe2 is confirmed. The synthesis and purification of the more unstable members of the CX2-XCZ family (X, Z=O, S, Se, or Te) are discussed. Some predictions, of possible use in identification, for the intense fundamental U3 of the so far unreported and probably very unstable OCTe, SeCTe, and CTe. are made. These are based on a treatment using a uniform potential energy function for all these molecules, to be presented in a subsequent paper.

No abstract