Observation of nuclear wave packets in the excited state of the F-center in alkali halides

Koyama, Takeshi; Nakajima, Makoto; Suemoto, Tohru

doi:10.1016/j.jlumin.2009.03.031

Cited by 1 publication

(3 citation statements)

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“…The former was employed for KBr and KI measurements, the latter for KCl and RbCl measurements. Details of the measurement systems were described in [61] and [65], respectively. The excitation photon energy was tuned to be resonant with the 1s-2p transition (table 1).…”

Section: Femtosecond Time-resolved Spectroscopymentioning

confidence: 99%

“…Picosecond spectroscopy has been conducted for revealing the dynamics and has made considerable progress in understanding the 2s-2p state mixing [50][51][52][53][54]. Recent developments of ultrafast laser spectroscopy in the femtosecond regime have provided a renewed interest in the relaxation dynamics [55][56][57][58][59][60][61][62][63][64][65]. They have enabled us to perform real-time observations of lattice vibration as a motion of a nuclear wave packet (NWP) [56,57,59,[60][61][62][63]65].…”

Section: Introductionmentioning

confidence: 99%

“…Recent developments of ultrafast laser spectroscopy in the femtosecond regime have provided a renewed interest in the relaxation dynamics [55][56][57][58][59][60][61][62][63][64][65]. They have enabled us to perform real-time observations of lattice vibration as a motion of a nuclear wave packet (NWP) [56,57,59,[60][61][62][63]65].…”

Section: Introductionmentioning

confidence: 99%

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Dynamics of nuclear wave packets at theFcenter in alkali halides

Koyama

Suemoto

2011

Rep. Prog. Phys.

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The F center in alkali halides is a well-known prototype of a strongly coupled localized electron-phonon system. This colour center is one of the long studied targets in the field of photophysics because it is simple but rich in variety. Steady-state spectroscopy, such as modulation spectroscopy and Raman scattering spectroscopy, has elucidated the strength of the electron-phonon coupling in the (meta-)stable state, i.e. the ground state and the relaxed excited state. Picosecond spectroscopy has improved understanding of the state mixing in the transient state. Owing to recent developments of ultrafast lasers with pulse widths shorter than oscillation periods of phonons, it has been possible to perform real-time observation of lattice vibration, and the understanding of the transient state has been remarkably expanded. In this paper, we review early and present studies on dynamics of electron-phonon coupling at the F center, especially recent real-time observations on the dynamics of nuclear wave packets in the excited state of the F center in KI, KBr, KCl and RbCl. These real-time observations reveal (i) spatial extension of the electronic wave function of a trapped electron, (ii) the difference between the coupled phonons in the ground state and the excited state, (iii) diabatic transition between the adiabatic potential energy surfaces and (iv) anharmonicity of the potential energy surface.

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Section: Femtosecond Time-resolved Spectroscopymentioning

confidence: 99%