Fast beam studies of I 2 and I 2 Ar photodissociation Alexandra

The photodissociation dynamics of bare I 2 and I 2 Ar at 413 and 390 nm have been investigated using a fast beam instrument coupled with a new photofragment coincidence imaging detector. Results from the application of this technique to the dissociation of I 2 and I 2 Ar yielded the dissociation energy of I 2 (D0ðI 2 Þ 1⁄4 1:012 0:008 eV) and I 2 –Ar binding energy (D0ðI 2 –ArÞ 1⁄4 45 8 meV). The experiments show that at these wavelengths, I 2 Ar undergoes three-body dissociation to I + I*+Ar, with very low momentum in the Ar atom and unequal momentum partitioning between the two I atoms. 2003 Elsevier Science B.V. All rights reserved.