Rotational and translational energy distributions of CN(v=0,J) from the hot atom reactions: H+XCN{yields}HX+CN(v=0,J), where X=Br, Cl, and CN
- Argonne National Laboratory, Chemistry Division, 9700 South Cass Avenue, Argonne, Illinois 60439 (United States)
The dynamics of the reactions of translationally energetic H atoms with BrCN, ClCN, and (CN){sub 2} was studied by determining both the rotational state distribution and the translational energy disposition of the CN product ground vibrational level. The reaction was carried out using H atoms with a most probable translational energy of 92 kJ mol{sup -1}. The CN radical was monitored by time- and frequency-resolved absorption spectroscopy using the CN red system (A {sup 2}{pi}(<-)X {sup 2}{sigma}) (2,0) band near 790 nm. Sub-Doppler resolution spectroscopy was used to determine the initial translational temperature of the CN(0,J) product. The fraction of the available reaction exothermicity that appeared as CN(0) rotational energy, f{sub R}, for H+XCN{yields}HX+CN was 0.034{+-}0.006, 0.061{+-}0.02, and 0.13{+-}0.007, for X=Br, Cl, and CN, respectively. Likewise, the fraction of the available reaction exothermicity that appeared as relative product translational energy, f{sub T}, was 0.52{+-}0.25, 0.52{+-}0.20, and 0.59{+-}0.05, for X=Br, Cl, and CN, respectively. The absolute reaction cross sections for the H+XCN{yields}HX+CN reactions were also measured to be 0.03, 0.02, and 0.3x10{sup -16} cm{sup 2} for X=Br, Cl, and CN, respectively. (c) 2000 American Institute of Physics.
- OSTI ID:
- 20215809
- Journal Information:
- Journal of Chemical Physics, Vol. 112, Issue 15; Other Information: PBD: 15 Apr 2000; ISSN 0021-9606
- Country of Publication:
- United States
- Language:
- English
Similar Records
Determination of the branching ratios for the reaction of hot H atoms with BrCN and CICN.
Channeling of products in the hot atom reaction: H + (CN)2(sub) (right arrow) HCN/HNC + CN, and in the reaction of CN with CH3(sub)SH.