Time resolved observation of the solvation dynamics of a Rydberg excited molecule deposited on an argon cluster-I: DABCO☆at short times

In recent years, the time-resolved X-ray diffraction technique has been established as an excellent tool for studying reaction dynamics and protein structural transitions with the aid of 100 ps X-ray pulses generated from third-generation synchrotrons. The forthcoming advent of the X-ray free-electron laser (XFEL) will bring a substantial improvement in pulse duration, photon flux and coherence of X-ray pulses, making time-resolved X-ray diffraction even more powerful. This technical breakthrough is envisioned to revolutionize the field of reaction dynamics associated with time-resolved diffraction methods. Examples of candidates for the first femtosecond X-ray diffraction experiments using highly coherent sub-100 fs pulses generated from XFELs are presented in this paper. They include the chemical reactions of small molecules in the gas and solution phases, solvation dynamics and protein structural transitions. In these potential experiments, ultrafast reaction dynamics and motions of coherent rovibrational wave packets will be monitored in real time. In addition, high photon flux and coherence of XFEL-generated X-ray pulses give the prospect of single-molecule diffraction experiments.

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A DIRECT MEASUREMENT OF INTERMOLECULAR SOLVATION DYNAMICS USING TIME-RESOLVED THZ SPECTROSCOPY (TRTS)

Photoinduced Charge Transfer ◽

10.1142/9789812793294_0018 ◽

2000 ◽

Author(s):

GORDON M. TURNER ◽

MATTHEW C. BEARD ◽

DEAN S. VENABLES ◽

CHARLES A. SCHMUTTENMAER

Keyword(s):

Direct Measurement ◽

Thz Spectroscopy ◽

Solvation Dynamics ◽

Time Resolved

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Solvation Dynamics Studied by Picosecond Fluorescence: Microscopic Reorientation and Longitudinal Relaxation of the Solvent

Laser Chemistry ◽

10.1155/1990/86536 ◽

1990 ◽

Vol 10 (5-6) ◽

pp. 413-429 ◽

Cited By ~ 12

Author(s):

A. Declémy ◽

C. Rulliére ◽

Ph. Kottis

Keyword(s):

Time Dependent ◽

Solvation Dynamics ◽

Specific Interactions ◽

Longitudinal Relaxation Time ◽

Time Resolved ◽

Different Temperatures ◽

Reorientation Time ◽

Longitudinal Relaxation ◽

Solvent Molecules ◽

Alcohol Solvents

The dynamics of the Time-Dependent Fluorescence Shift (TDFS) of a rigid polar excited probe dissolved in alcohol solvents at different temperatures have been studied by picosecond time-resolved spectroscopy. The results are compared to previously published results on well characterized polar systems. These results show that solvation dynamics in such systems are strongly scaled by the microscopic (singleparticle) reorientation time τM of the solvent molecules and/or by the (macroscopic) longitudinal relaxation time τL of the solvent. The key point governing this scaling is the relative interaction between the solvent molecules and the probe compared to the interaction between the solvent molecules. It is also shown that specific interactions, such as hydrogen bonded-complex formation, may play an important role.

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Time-Resolved Terahertz Spectroscopy of Condensed Phase Reactions

Laser Chemistry ◽

10.1155/1999/85151 ◽

1999 ◽

Vol 19 (1-4) ◽

pp. 145-148

Author(s):

Richard McElroy ◽

Klaas Wynne

Keyword(s):

Terahertz Spectroscopy ◽

Low Frequency ◽

Electronic States ◽

Carrier Dynamics ◽

Solvation Dynamics ◽

Vibrational Modes ◽

Time Resolved ◽

Condensed Phase Reactions ◽

Probe Spectroscopy ◽

First Time

Ultrafast time-resolved visible-pump, far-IR (THz) probe spectroscopy has been developed in our lab and has been applied to study carrier dynamics in photoexcited GaAs and dipole solvation dynamics in betaine and p-nitroaniline. This type of spectroscopy enables us to study for the first time the nonequilibrium interaction between excited electronic states and low frequency vibrational modes.

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