Spectroscopic Studies of the Gas-Phase ArCH(D) Complexes: I. Detection andAnalysis of B-X Electronic Transitions of ArCH by Laser-Induced Fluorescence

摘要

Gas-phase argon-methylidyne (ArCH) van der Waals (vdW) complexes have beendetected spectroscopically by laser-induced fluorescence (LIF) near CH B(2)sigma - X(2) Pi sub r (0,0) and (1,0) transitions. They are formed in a supersonic free-jet expansion of argon seeded with CH radicals generated by the 248-nm photolysis of CHBr2Cl. The LIF spectra reveal a number of rovibronic bands that are assigned to stretching and/or bending motions of the ArCH complex. From the spectra, lower limits for the ground and excited state binding energies are estimated. Analysis of the rotational energy level structure based on combination differences and computer simulations of eight of the rovibronic bands yields an average ground