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Technical Physics Letters

Impact excitation of squeezed vibrational packets in molecules

Alexandr V. Belousov, Viktor A Kovarskii, O. B. Prepelitsa

Published Jul 1, 1998• 0 citations
Publisher

Abstract

An analysis is made of vibrational packets created in molecules by collisions with fast protons. Some characteristic features of the Raman light scattering spectrum are discussed for a molecule with squeezed vibrational states. It is suggested that squeezed vibrational states in the ground electronic state of a molecule may be used for isotope separation.

DOI
10.1134/1.1262174

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An analysis is made of vibrational packets created in molecules by collisions with fast protons. Some characteristic features of the Raman light scattering spectrum are discussed for a molecule with squeezed vibrational states. It is suggested that squeezed vibrational states in the ground electronic state of a molecule may be used for isotope separation.
An analysis is made of some features of spontaneous resonance Raman scattering representing a noise signal which is amplified by a strong field in a nonlinear medium. A detailed review is made of the experimental results obtained in investigations of the spectra of stimulated preresonance and resonance Raman scattering in nonlasing and lasing systems. It is shown that, depending on the experimental conditions, these spectra may be due to transitions between vibrational levels of molecules which are in the ground or first excited electronic states. The example of several compounds is used to demonstrate the information which can be derived from such spectra. Possible practical applications of studies of such spectra are indicated. The physical basis of the theory of stimulated resonance Raman scattering is discussed and conclusions are drawn on the nature and mechanism of this Raman effect.
A pair of coherent femtosecond pulse excitations applied to a molecule with strong electron-phonon coupling creates a coherent superposition of a low momentum and a high momentum wavepacket in the vibrational states of both the excited state and the ground state of the coherent transition. As the excited state is accelerated further, interference between the high momentum ground state contribution and the low momentum excited state contribution causes a photon echo. This photon echo is a direct consequence of quantum interference between separate vibrational trajectories and can therefore provide experimental evidence of the non-classical properties of molecular vibrations.