Naphthalene-Rare Gas Solids: Absorption Spectra from 30000–30000 cm−1

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Abstract
The absorption spectra (30000–80000 cm−1) of naphthalene-rare gas solids (molar ratio 1:200) are reported. The congested band system in the region of the second π∗-π transition is analysed. Observed higher π∗-π transitions are compared with theoretical predictions. The assignments of the lowest (n = 3) Rydberg states (with different quantum defects) to bands observed in the free molecule spectrum at 45070 cm−1 and 45390 cm−1 is supported. Intermediate and large radius impurity states of the matrix are identified and characterized. Crystal energy parameters for the matrix are deduced from spectroscopic data and photoemission data. Matrix shifts for the origin bands of the first four π∗-π transitions are reported.