Controlling the Bimolecular Reaction and Photodissociation of HNCO through Selective Excitation of Perturbed Vibrational States†

2000 ◽  
Vol 104 (45) ◽  
pp. 10356-10361 ◽  
Author(s):  
Woods ◽  
H. Laine Berghout ◽  
Christopher M. Cheatum ◽  
F. Fleming Crim
Keyword(s):  
Selective Excitation ◽  
Bimolecular Reaction ◽  
Vibrational States

Selective Excitation of Vibrational States by Shaping of Light-Induced Potentials

2000 ◽  
Vol 85 (20) ◽  
pp. 4241-4244 ◽  
Author(s):  
Ignacio R. Solá ◽  
Bo Y. Chang ◽  
Jesús Santamaría ◽  
Vladimir S. Malinovsky ◽  
Jeffrey L. Krause
Keyword(s):  
Selective Excitation ◽  
Vibrational States

State- and bond-selected photodissociation and bimolecular reaction of water

1990 ◽  
Vol 332 (1625) ◽  
pp. 259-272 ◽  
Keyword(s):  
Room Temperature ◽  
Reaction Dynamics ◽  
Bimolecular Reaction ◽  
Water Molecules ◽  
Vibrational States ◽  
Vibrationally Excited ◽  
Stretching Vibration ◽  
Different Populations ◽  
H 20 ◽  
Selection Of

It is possible to exploit the isolation of the 0 —H stretching vibration in H 20 and HOD to control the photodissociation and reaction dynamics in water molecules excited in the region of the third overtone (4rOH) of the 0 -H stretch. In vibrationally mediated photodissociation of H 20, the selection of different initial stretching states having roughly the same energy leads to drastically different populations of the vibrational states of the OH photolysis product. By exciting the O-H stretching overtone in HOD, we can selectively photolyze that bond. In bimolecular reaction experiments, we react H 20 (4rOH) with H atoms to produce H 2 and OH. The reaction, which is endothermic, proceeds at an undetectable rate in our room temperature measurements. Vibrationally excited water, however, reacts at roughly the gas kinetic collision rate. Applying this technique to HOD (4rOH) allows us to demonstrate bond selected bimolecular chemistry in which the reaction produces only OD. This observation suggests a general approach to assessing bond controlled reactions in a variety of systems.

SELECTIVE EXCITATION OF HIGH VIBRATIONAL STATES OF HYDROGEN FLUORIDE IN A THERMAL ENVIRONMENT BY ULTRAFAST INFRARED LASER PULSES

2010 ◽  
Vol 09 (02) ◽  
pp. 401-414 ◽  
Author(s):  
KAI NIU ◽  
LI-QING DONG ◽  
SHU-LIN CONG
Keyword(s):  
Pulse Train ◽  
Matrix Theory ◽  
Thermal Environment ◽  
Coupling Parameter ◽  
Single Pulse ◽  
Laser Pulses ◽  
Selective Excitation ◽  
Vibrational States ◽  
Reduced Density ◽  
Density Matrix Theory

The selective excitation of the high ground vibrational state of rotationless HF in an unobserved quasi-resonant thermal environment under the control of a single pulse and pulse train is studied using the reduced density matrix theory. It is shown that the pulse train can enhance the population transfer probability. The numerical results reveal that the vibrational relaxation process is affected by the distribution of the environment frequency and the molecule–environment coupling intensity. The effects of the molecule–environment coupling parameter and the overlapping pulses on the population of the target state of HF are also discussed.

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