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The present paper presents a continuation of measurements on the gaseous heat capacities by the adiabatic expansion method. The apparatus and the experimental procedure are exactly the same as described in the previous papers denoted herein as Part I and Part II. The compounds with which the present paper deals are dimethyl ether, ethylene oxide, dimethyl acetylene, cis-butane-2 and trans-butene-2. For the correction of the experimental data to the ideal gas state several procedures had to be used, as discussed in Part II.

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The present paper describes a continuation of the work on the heat capacities of lower hydrocarbons by the Lummer-Pringsheim adiabatic expansion method. The apparatus and the procedure described in the first paper of this series, henceforth to be denoted as Part I, was used in the present research without important modifications.

High power laser photochemistry. Production of neutral atomic and small molecular fragments by UV multiphoton dissociation J. Chem. Phys. 84, 527 (1986); 10.1063/1.450119UVlaser photochemistry of diborane at 193.3 nm: The exchange reaction with deuterium CF2Br2 has been irradiated at room temperature with KrF (248.4 nm) and ArF (193.3 nm) lasers. The fluorescence produced by the KrF laser irradiation appears to consist of only two V 2 progressions, V'2 = 6 and 5 for the CF 2 ('B, -X 'A,) transition. The collision-free lifetime of the CF 2 emission was found to be 59 ns. The fluence dependence of the emission is quadratic. Upon irradiation of CF2Br2 with an ArF laser various emitting species were noted. Emission from CF(A 2l:+ -X 2n), CF(B 26,_X 2n), CFl 2 B,-X 'A,), and Br2Cno+.-'l:t ) molecules was noted. Laser-induced fluorescence excitation spectra confirmed the presence of CF 2 . The ArF laser fluence dependence of CF 2 (X 'A d formation was found to be 1.0. 3926