Simplified optical assembly for single-molecule spectroscopy

Chapter
Part of the NATO Science Series book series (NAII, volume 90)

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 was designed to fit a small helium cryostat with a 33 mm diameter neck [1], A procedure of preadjustment of the position of the focusing lens for a known index of refraction of the environment (such as superfluid liquid helium, helium gas, or vacuum) was developed ensuring excitation of only a small area of a thin film of frozen solution; no adjustment of the lens is required during an experiment. Low impurity concentration in a sample solution and inhomogeneous broadening of the impurity spectra together with high selectivity of narrow laser excitation makes it possible to register pure-electronic spectral lines of single impurity molecules. A signal-to-noise ratio of 15:1 was achieved for single-molecule spectra of terrylene in the Shpol’skii matrix n-decane [2]. Timedependent measurements of shape and spectral position of single-molecule lines makes it possible to obtain information on dynamical processes in solid matrices at low temperatures [2, 3, 4].

Keywords

Helium Fluoride Refraction Terrylene 

References

  1. 1.
    V. Palm, Rev. Sci. Instrum., 70, 7, 2957–2959, (1999).CrossRefGoogle Scholar
  2. 2.
    K.K. Rebane, O. Ollikainen, V.V. Palm, Opt. Spectrosc. (USA), 84, 3, 374–380, (1998) [Transi, of Opt. Spektrosk. (St. Petersburg), 84, 3, 431-438, (1998)].Google Scholar
  3. 3.
    N. Caspary, V. Palm, K.K. Rebane, V.E. Bondybey, Chem. Phys. Lett., 283, 5-6, 345–349, (1998).CrossRefGoogle Scholar
  4. 4.
    V. Palm, K. Rebane, J.Lumin., 86, 3-4, 207–209, (2000).CrossRefGoogle Scholar

Copyright information

© Springer Science+Business Media Dordrecht 2002

Authors and Affiliations

  • V. Palm
    • 1
  1. 1.University of TartuEstonia

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