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Temperature Dependence of the Ultraviolet Absorption Spectrum of Naphthalene in Solution

1954; American Institute of Physics; Volume: 22; Issue: 6 Linguagem: Inglês

10.1063/1.1740253

1520-9032

R. Passerini, Ian Ross,

Free Radicals and Antioxidants

The absorption spectrum of naphthalene solutions has been measured, in the region 3300—2400A, at temperatures between +60°C and —185°C. Particular attention was given to the long-wavelength vibrational bands of the first electronic transition (3200—2900A), in order to locate and establish the identity of the band origin. The band acquires most of its intensity through the participation of an active vibration, whose ground-state frequency measured from two observed vibrational bands, is 525±20 cm—1, in adequate agreement with the value 544±60 cm—1 found from the temperature dependence of intensity of the 0←1 band in this frequency. This is probably the Raman ag frequency 512 cm—1, which identification, in conjunction with previous polarization measurements, assigns the transition as B2u← Ag. Frequency and intensity data are given for 26 bands of this and the next transition (2900—2400A); the latter appears, vibrationally, to be allowed.