Effect of rotational quantum states (J=0, 1) of matrix H2 molecules on ESR spectra of radicals at 4.2 K

✍ Scribed by Tetsuo Miyazaki; Kenji Yamamoto; Junji Arai

• Publisher: Elsevier Science
• Year: 1994
• Tongue: English
• Weight: 272 KB
• Volume: 219
• Category: Article
• ISSN: 0009-2614
• DOI: 10.1016/0009-2614(94)00104-9

✦ Synopsis

The effect of rotational quantum states (J= 0, 1) of matrix Hz molecules on the ESR spectra of CHs, CD, and CsHs radicals has been studied at 4.2 K. The alkyl radicals are produced by the photolysis of the alkyl iodides in the Hz matrix. ESR spectra of the radicals in a n-H, matrix containing 75% o-H, (J= 1) and 25% P_H* consist of broad peaks, while spectra in the p-H2 (J= 0) matrix consist of extremely narrow lines and the hypertine structures can be clearly observed in the spectra. Since the total nuclear magnetic moment of p-H2 is zero, the dipole interactions of the electron spin magnetic moments of an alkyl radical with the surroundingpH, molecules disappear completely, resulting in the narrowing of the ESR spectra.