Experimental and theoretical investigation of the dispersed fluorescence spectroscopy of HC4S

摘要

A high-resolution single vibronic level emission study from the (A) over tilde (2)Pi(3/2) state of the HC4S radical is reported. Ground state density functional theory frequencies have been used to assign ground state vibronic levels involving three stretching modes nu(2), nu(3), and nu(5) in the region of 0-3250 cm(-1), while the frequency of nu(4) remains speculative. Tentative assignments are given for the complicated structures arising from Renner-Teller and spin-orbit interactions within the bending energy levels. From analysis of the dispersed emission spectra, Fermi resonances involving pairs of bands have been identified in the (A) over tilde (2)Pi(3/2)<-(X) over tilde (2)Pi(3/2) laser induced fluorescence spectrum.