Signatures of Vibrational and Electronic Quantum Beats in Femtosecond Coherence Spectra.
Signatures of Vibrational and Electronic Quantum Beats in Femtosecond Coherence Spectra.
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DOI:
10.1021/acs.jpca.0c10807
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发表时间:
2021-04-01
期刊:
影响因子:
--
通讯作者:
Turner DB
中科院分区:
文献类型:
--
作者:
Arpin PC;Turner DB
Femtosecond laser pulses can produce oscillatory signals in transient-absorption spectroscopy measurements. The quantum beats are often studied using femtosecond coherence spectra (FCS), the Fourier domain amplitude, and phase profiles at individual oscillation frequencies. In principle, one can identify the mechanism that gives rise to each quantum-beat signal by comparing its measured FCS to those arising from microscopic models. To date, however, most measured FCS deviate from the ubiquitous harmonic oscillator model. Here, we expand the inventory of models to which the measured spectra can be compared. We develop quantum-mechanical models of the fundamental, overtone, and combination-band FCS arising from harmonic potentials, the FCS of anharmonic potentials, and the FCS of a purely electronic dimer. This work solidifies the use of FCS for identifying electronic coherences that can arise in measurements of molecular aggregates including photosynthetic proteins. Furthermore, future studies can use the derived expressions to fit the measured FCS and thereby extract microscopic parameters of molecular potential-energy surfaces.
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