Time-resolved CARS measurements of vibrational decoherence of I₂ isolated in matrix Ar

• Veröffentlicht in: Физика низких температур
• Datum: 2003
• Hauptverfasser: Karavitis, M., Segale, D., Bihary, Z., Pettersson, M., Apkarian, V.A.
• Format: Artikel
• Sprache: English
• Veröffentlicht: Фізико-технічний інститут низьких температур ім. Б.І. Вєркіна НАН України 2003
• Schlagworte: Spectroscopy in Cryocrystals and Matrices
• Online Zugang: https://nasplib.isofts.kiev.ua/handle/123456789/128933
• Назва журналу: Digital Library of Periodicals of National Academy of Sciences of Ukraine
• Zitieren: Time-resolved CARS measurements of vibrational decoherence of I₂ isolated in matrix Ar / M. Karavitis, D. Segale, Z. Bihary, M. Pettersson, V.A. Apkarian // Физика низких температур. — 2003. — Т. 29, № 9-10. — С. 1071-1080. — Бібліогр.: 26 назв. — англ.

Time-resolved coherent anti-Stokes Raman scattering is applied to prepare and interrogate vibrational coherences on the ground electronic surface of molecular iodine isolated in Ar matrices. The coherence decay time shows a linear dependence on vibrational quantum numbers, for v = 3–15. The temperature dependence of decoherence rates is negligible for v < 7, in the experimental range T = 18–32 K. For a v = 13, 14 superposition, the temperature dependence indicates dephasing by a 66 cm–¹ pseudo-local phonon, just outside the Debye edge of the solid. The accuracy of the data is limited due to two-photon induced dissociation of the molecule, which process is characterized using polarized fields. The T → 0 limit of dephasing is discussed.