Purely electronic zero-phonon line as the foundation stone for high-resolution matrix spectroscopy, single-impurity-molecule spectroscopy, and persistent spectral hole burning. Recent developments

A few examples of recent progress in the study and applications of purely electronic zerophonon line (ZPL) and its offshoots are briefly considered: new experimental values of the narrowest ZPL; time-and-space-domain holography in the femtosecond domain, and the realization of a femtosecond Taffoli gate by it; single-impurity-molecule spectroscopy, its relation to single-photon interference and to the realization of quantum computing; the promises of quantum computing compared to what has already been done in holography

PHONONS IN RESONANT SECONDARY EMISSION OF IMPURITY MOLECULES IN CRYSTALS

Resonant Raman scattering (RS), hot luminescence (HL) and ordinary luminescence (OL) were studied in the spectra of S2 and Se2 impurity molecules in KI at various frequencies of laser excitation and temperatures. Characteristic times of phase relaxation in the excited electronic state caused by phonon scattexing were estimated. In contradiction with the simple version of the RSE theory no resonance in the Raman scattering cross section was observed when the excitation frequency was close or in resonance with a sharp no-phonon absorption line