The vibrational quenching of O+2(v) by Kr as a function of relative kinetic energy

✍ Scribed by M. Kriegl; R. Richter; P. Tosi; W. Federer; W. Lindinger; E.E. Ferguson

• Publisher: Elsevier Science
• Year: 1986
• Tongue: English
• Weight: 278 KB
• Volume: 124
• Category: Article
• ISSN: 0009-2614
• DOI: 10.1016/0009-2614(86)85081-3

✦ Synopsis

The collisional relaxation of vibrationally excited 02 ions by Kr has been measured from thermal energy to 2 eV relative center-of-mass kinetic energy. The rate constant decreases from 1.5 x lo-*' cm3 s-' at 300 K to a broad minimum of 9 X lo-l2 cm3 s-' between 0.1 and 0.3 eV and then increases to 6 X lo-" cm3 s-' at 2 eV. The quenching at low kinetic energies ( < 0.1 eV) is attributed to the long-range chemical attraction arising from the specific chemical bonding of 02 and Kr, while the quenching at higher kinetic energies ( > 0.3 ev) is presumably due to the short-range repulsive forces. This is the first observation of this transition for vibrational quenching of a molecular ion.