Abstract
A simplified modification of an optical assembly for single-molecule spectroscopy with the sample located at the joint focus of a parabolic mirror and a focusing lens is described. The optical cell fits a small helium cryostat with a 33 mm diam neck and can be used for experiments with thin films of frozen solutions as well as with other types of thin films. Described is the procedure of preadjustment of the position of a fixed focusing lens for work in different environments with the known index of refraction, such as superfluid liquid helium, helium gas, or vacuum; no adjustment of the lens during the experiment is required. A similar design of an optical cell could be used in a high-pressure cryostat with solid helium where the position of the lens cannot be adjusted. A signal-to-noise ratio of 15:1 was achieved for single-molecule spectra of terrylene in the Shpol’skii matrix n-decane.
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