scholarly journals Vibrational Relaxation Process of Polyatomic Molecules Adsorbed in Zeolites

1999 ◽  
Vol 19 (1-4) ◽  
pp. 321-324 ◽  
Author(s):  
Ken Onda ◽  
Michio Yaginuma ◽  
Akihide Wada ◽  
Kazunari Domen ◽  
Chiaki Hirose
Keyword(s):  
Temperature Dependence ◽  
Relaxation Process ◽  
Vibrational Relaxation ◽  
Metal Carbonyl ◽  
Laser Pulses ◽  
Infrared Laser ◽  
Polyatomic Molecules ◽  
Vibrational Modes ◽  
Pump Probe ◽  
Zeolite Surface

The vibrational relaxation lifetimes of the CO stretching mode of Cr(CO)6 and Mo(CO)6 adsorbed in the cage of the HY, DY and NaY-type zeolites were measured at various temperature by pump-probe method using picosecond infrared laser pulses. It was shown by comparing the lifetimes that the accepting modes include both the vibrational modes of the metal carbonyl and those associated with the cations on the zeolite surface. The analysis of the temperature dependence of the lifetimes revealed that the number of the excited accepting modes are four with their energy lying around 500 cm-1.

scholarly journals Modeling the Vibrational Relaxation of Polyatomic Molecules. The Methylfluoride Case Study

1990 ◽  
Vol 10 (3) ◽  
pp. 147-158
Author(s):  
V. Tosa ◽  
R. Bruzzese ◽  
C. de Lisio ◽  
S. Solimeno
Keyword(s):  
Relaxation Time ◽  
Relaxation Process ◽  
Vibrational Relaxation ◽  
Vibrational Energy ◽  
Polyatomic Molecules ◽  
Rate Equations ◽  
Strongly Nonlinear ◽  
Nonlinear Character ◽  
Intermediate Size

We present in this paper a theoretical analysis of the vibrational translational (V-T) relaxation process in CH3F, carried out by using a numerical model based on rate equations. In particular, we have analysed the dependence of the V-T relaxation time on the average vibrational energy absorbed per molecule. We have also investigated the influence of the dependence of the rate constants used in the model, on the gas translational temperature. The results of the model clearly outline the strongly nonlinear character of the V-T relaxation process in CH3F, a situation commonly observed in other important polyatomic molecules of intermediate size each as SF6, freons, and related methylhalides.

scholarly journals Достижение субпикосекундного временного разрешения при исследовании процессов анизотропной релаксации биологических молекул

2020 ◽  
Vol 46 (4) ◽  
pp. 7
Author(s):  
И.А. Горбунова ◽  
М.Э. Сасин ◽  
О.С. Васютинский
Keyword(s):  
Energy Transfer ◽  
Excited State ◽  
Excited States ◽  
Rotational Diffusion ◽  
Laser Pulses ◽  
Femtosecond Laser Pulses ◽  
Polyatomic Molecules ◽  
Biological Molecules ◽  
Pump Probe ◽  
First Time

A novel pump-probe method has been developed to study anisotropic relaxation and energy transfer in excited states of polyatomic molecules excited by femtosecond laser pulses. The method was used to study the rotational diffusion of NADH with a temporal resolution of about 0.6 ps. For the first time, absorption from the excited state of biological molecules pumped by laser pulses with energies of 1 nJ was detected

Excitation and dissociation of polyatomic molecules under the action of femtosecond infrared laser pulses

2007 ◽  
Vol 1 (2) ◽  
pp. 113-119 ◽  
Author(s):  
V. M. Apatin ◽  
V. O. Kompanets ◽  
V. B. Laptev ◽  
Yu. A. Matveets ◽  
E. A. Ryabov ◽  
...  
Keyword(s):  
Laser Pulses ◽  
Infrared Laser ◽  
Polyatomic Molecules

scholarly journals Pulse compression of submillijoule few-optical-cycle infrared laser pulses using chirped mirrors

2009 ◽  
Vol 34 (12) ◽  
pp. 1894 ◽  
Author(s):  
Mathieu Giguère ◽  
Bruno E. Schmidt ◽  
Andrew D. Shiner ◽  
Marie-Andrée Houle ◽  
Heidi C. Bandulet ◽  
...  
Keyword(s):  
Pulse Compression ◽  
Laser Pulses ◽  
Infrared Laser ◽  
Optical Cycle

Temperature dependence of the normal vibrational modes of hcp Zr

1978 ◽  
Vol 18 (6) ◽  
pp. 2632-2642 ◽  
Author(s):  
C. Stassis ◽  
J. Zarestky ◽  
D. Arch ◽  
O. D. McMasters ◽  
B. N. Harmon
Keyword(s):  
Temperature Dependence ◽  
Vibrational Modes ◽  
Normal Vibrational Modes

scholarly journals Two-photon vibrational excitation of air by long-wave infrared laser pulses

2016 ◽  
Vol 94 (2) ◽  
Author(s):  
J. P. Palastro ◽  
J. Peñano ◽  
L. A. Johnson ◽  
B. Hafizi ◽  
J. K. Wahlstrand ◽  
...  
Keyword(s):  
Vibrational Excitation ◽  
Laser Pulses ◽  
Infrared Laser ◽  
Two Photon ◽  
Long Wave ◽  
Long Wave Infrared

scholarly journals Nonperturbative generation of above-threshold harmonics from pre-excited argon atoms in intense mid-infrared laser fields

2017 ◽  
Vol 5 ◽  
Author(s):  
Guihua Li ◽  
Hongqiang Xie ◽  
Ziting Li ◽  
Jinping Yao ◽  
Wei Chu ◽  
...  
Keyword(s):  
Excited State ◽  
Femtosecond Laser ◽  
Pulse Energy ◽  
Laser Pulses ◽  
Infrared Laser ◽  
Femtosecond Laser Pulses ◽  
Probe Laser ◽  
Laser Fields ◽  
Mid Infrared ◽  
Highly Nonlinear

We experimentally investigate the generation of above-threshold harmonics completely from argon atoms on an excited state using mid-infrared femtosecond laser pulses. The highly nonlinear dependences of the observed signal on the pulse energy and polarization of the probe laser pulses indicate its nonperturbative characteristic.

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