Laws governing laser radiation from 2-hetaryloxazoles and their cations

Abstract

The relativistic R-matrix method is used to calculate elastic and inelastic cross sections for electrons incident on caesium atoms with energies from 0-3 eV. In addition to the total cross sections, results are presented on the differential cross section, cr, and the spin polarisation, Py, of the scattered electrons as a function of energy at the scattering angles IO", SO", 90" and 150". The calculation reveals a wealth of resonances around the 2P,,, and 2P,,, thresholds. The resonances are analysed in detail and their role in the scattering process is discussed.

Excited state proton transfer dye lasers

“…Thus 2-heteryloxazoles and their cations fluoresce efficiently and lase separately. 40 However, solutions with simultaneous efficient fluorescence of both the initial heteryloxazole and cation, do not lase at certain ratio of the components. As the concentration of a proton donor (acetic acid) in ethanolic solutions of 2-heteryloxazoles is increased, the quantum yields of fluorescence of the initial form are decreased, and a band of fluorescence of a protonated form resulting from the proton phototransfer appears in the longwave region of the spectrum, 30 and the efficiency of laser radiation of the initial form drops to zero at low concentrations of acetic acid.…”