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- W2093915415 abstract "A Bloch equation describing infrared multiphoton absorption in an isolated polyatomic molecule is derived from first principles. The molecule is divided into a ’’system’’ mode which interacts directly with the laser field and a ’’bath’’ consisting of the remaining modes which interact with each other and the system mode via intramolecular vibrational coupling. In addition to describing the evolution of the system, the derived equation keeps track of changes in the bath state and the resulting changes in the bath–system interaction which occur as the bath gains energy. Unlike the master (or rate) equation for optical pumping, the Bloch equation is valid for arbitrary ratios W/Ω of the intramolecular relaxation rate W/h/ to the Rabi frequency of the system mode Ω/h/. The equation derived differs from certain Bloch equations previously proposed on phenomenological grounds by the appearance of off-diagonal coupling terms. These terms may significantly reduce the vibrational dephasing rate and thus affect net pumping rates and optical line shapes for vibrationally excited molecules." @default.
- W2093915415 created "2016-06-24" @default.
- W2093915415 creator A5012879989 @default.
- W2093915415 date "1981-08-15" @default.
- W2093915415 modified "2023-09-23" @default.
- W2093915415 title "The Bloch equation for multiphoton absorption. I. Derivation" @default.
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- W2093915415 doi "https://doi.org/10.1063/1.442248" @default.
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