OBSERVATION OF THE INFRARED-SPECTRA OF THE NH2-STRETCHING VIBRATION MODES OF ANILINE-AR-N (N=1,2) CLUSTERS IN A SUPERSONIC JET USING REMPI

The infrared spectra of the NH2 stretching modes of aniline-Ar-n (n = 1, 2) clusters and corresponding cluster cations in a supersonic jet h ave been observed using an IR-REMPI double resonance technique, The ob served frequencies of the aniline-Ar cluster are nu(sym) = 3422, and n u(asym) = 3508 cm(-1), and those of the aniline-Ar+ cation are nu(sym) = 3395 and nu(asym) = 3489 cm(-1). The frequency shifts of the NH2 st retching modes due to the Ar atoms have been found to be small, The an iline-Ar+ cluster ionized by the REMPI method has been found to be col d and the infrared spectrum shows no hot bands from the van der Waals modes, even though the excess energy above the ionization is as much a s 5600 cm(-1). A process which gives the cold clusters is discussed.