Search

Abstract: The infrared (IR) photodissociation of aniline–water–methanol cluster ion was investigated in the 2600–3900cm−1 region to examine the factors which play key roles in determining the branching ratio of a concurrent predissociation reaction. The dominant channel in the IR predissociation of AWM+ (A: aniline, W: water, M: methanol) was AWM+ →AM+ at all vibrational modes although the calculated binding energies of water and methanol were nearly the same. Also, the branching ratio was slightly dependent on the specific excited mode, ranging from 0.036 to 0.074; the most effective mode to kick out methanol was OH vibration of methanol. [ABSTRACT FROM AUTHOR]

Vibrational predissociation dynamics of aniline(water) n + cluster ions formed via resonance two photon ionization followed by the absorption of single infrared photon was investigated. A linear tandem time of flight mass spectrometer designed for this research was tested by the dissociation of aniline + at 266 nm and observed decay constant matched well with the previous result. The rate of dissociation of aniline(water) n + cluster increased with internal energy, whereas decreased with increasing the size of cluster, manifesting that the intramolecular vibrational energy redistribution precedes VP. The internal energies of the cluster ions were estimated from comparing the experimental and Rice–Ramsperger–Kassel–Marcus calculation results. [ABSTRACT FROM AUTHOR]