The experimental work of Savard and the theoretical work of Sponer on the absorption spectrum of toluene vapor is extended. A spectrum of 209 bands was observed with partial resolution of the fine structure. A tentative analysis is given based on ground state frequencies 514, 620, 785, 1003, 1012, 1176, and 1209, which correlate completely with Raman data; on excited state frequencies, 456, 528, 751, 932, 964, and 1186; and on difference frequencies 59 and 178 cm−1. Assuming C2v symmetry, all frequencies below 1300 cm−1 of symmetry class A1 appeared in 1–0 transitions and with one exception in 0–1 transitions. In addition, a vibrational frequency of symmetry class B1, deriving from an εg+ vibration in benzene, appeared strongly both in the ground and excited state.
The six fundamental vibrational frequencies of methyl deuteride were observed and the fine structure of the bands resolved. The frequencies are v6 = 1156.3, v5 = 1306.8, v4 = 1477.1, v3 = 2205.25, v1 = 2983.0, v2 = 3031.0. From the fine structure of the bands, the moments of inertia are found to be IA=7.166×10−40 g cm2,IC=5.298×10−40 g cm2and the internuclear distances are C–H=1.093×10−8 cm, H–H=1.785×10−8 cm.From the four previously known frequencies of methane and each of the frequencies of this molecule, the values of the five potential constants are computed. Three of the sets are consistent and agree well with the values found by Dennison and Johnston, but the other three sets have either negative or imaginary values. The frequencies from which these are calculated are the ones which take part in a resonance interaction which was not included in the theory. From the observed spacings of the zero branches of the perpendicular bands, extreme ranges of the rotation-vibration interaction factors are computed. An overtone, 2v4 = 2923, was also observed as were three frequencies of the molecule CH2D2, at 1036.0, 1090.5, and 1235.5 cm—1.
Reflection and transmission measurements of an anodic-oxide film grown on GaAs have been carried out from 0.01 to 6 eV (100 to 48 000 cm−1). The dispersion in the index of refraction has been determined in the high-frequency range from an analysis of reflection interference fringes. The ir reflection and transmission spectra of crystalline arsenolite, amorphous As2O3, polycrystalline β-Ga2O3, and amorphous Ga2O3 have been measured and compared with the anodic-oxide spectrum. In the anodic oxide, three vibration bands at 305, 600, and 800 cm−1 have been found and two bands at 350 and 550 cm−1 have been inferred, all of which can be assigned to the arsenic-oxide and gallium-oxide constituents of the film. Lines assigned to arsenic oxide in the anodic oxide have much broader widths than the corresponding lines in amorphous arsenic oxide. The anodic-oxide bands are analyzed to determine their contribution to the dc dielectric constant.
The absorption spectrum of phenol as observed with a 3-m grating spectrograph consisted of 330 bands. A tentative analysis is made on the basis of the fundamental ground-state frequencies 245, 397, 527, 811, 824, and 999 and the fundamental excited-state frequencies 208, 374, 476, 562, 783, 935, 975, 1274, and 1565. These agree well with Raman data.
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