Abstract
Experimental and theoretical studies have been carried out for nanosecond 355 nm laser induced dissociation/ionisation of dihalomethanes (CH 2Cl 2 and CH 2Br 2) using time of flight mass spectrometer. Both the molecules follow quite similar ionisation pattern and mass spectra showed H +, CH 2 +, X +, CX +, and CH 2X + as major ions with absence of parent ion peak. The energetics of different dissociation channels in the ground state of CH 2X +/CH 2X systems was investigated using ab initio calculations. Proposed mechanism involves dissociation of CH 2X 2 into CH 2X, which then dissociates into several distinct competitive channels, products of which are subsequently ionised.
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