Rotationally Resolved IR-Diode Laser Studies of Ground-State CO(2) Excited by Collisions with Vibrationally Excited Pyridine.

Rotationally Resolved IR-Diode Laser Studies of Ground-State CO(2) Excited by Collisions with Vibrationally Excited Pyridine. Research Abstract Details 

Research Abstract Table of Contents

Jump to the:

Rotationally Resolved IR-Diode Laser Studies of Ground-State CO(2) Excited by Collisions with Vibrationally Excited Pyridine. Abstract Text:

Jeremy A Johnson,Kilyoung Kim,Maurine Mayhew,Deborah G Mitchell,Eric T Sevy,

Relaxation of highly vibrationally excited pyridine (C5NH5) by collisions with carbon dioxide has been investigated using diode laser transient absorption spectroscopy. Vibrationally hot pyridine (E' = 40 660 cm-1) was prepared by 248 nm excimer laser excitation followed by rapid radiationless relaxation to the ground electronic state. Pyridine then collides with CO2, populating the high rotational CO2 states with large amounts of translational energy. The CO2 nascent rotational population distribution of the high-J (J = 58-80) tail of the 0000 state was probed at short times following the excimer laser pulse to measure rate constants and probabilities for collisions populating these CO2 rotational states. Doppler spectroscopy was used to measure the CO2 recoil velocity distribution for J = 58-80 of the 0000 state. The energy-transfer distribution function, P(E,E'), from E' - E approximately 1300-7000 cm-1 was obtained by re-sorting the state-indexed energy-transfer probabilities as a function of DeltaE. P(E,E') is fit to an exponential or biexponential function to determine the average energy transferred in a single collision between pyridine and CO2. Also obtained are fit parameters that can be compared to previously studied systems (pyrazine, C6F6, methylpyrazine, and pyrimidine/CO2). Although the rotational and translational temperatures that describe pyridine/CO2 energy transfer are similar to previous systems, the energy-transfer probabilities are much smaller. P(E,E') fit parameters for pyridine/CO2 and the four previously studied systems are compared to various donor molecular properties. Finally, P(E,E') is analyzed in the context of two models, one indicating that P(E,E') shape is primarily determined by the low-frequency out-of-plane donor vibrational modes, and the other that indicates that P(E,E') shape can be determined from how the donor molecule final density of states changes with DeltaE.

Rotationally Resolved IR-Diode Laser Studies of Ground-State CO(2) Excited by Collisions with Vibrationally Excited Pyridine. Publishing Authors By Initials

JA Johnson,K Kim,M Mayhew,DG Mitchell,ET Sevy,

For similar abstracts research abstracts see: abstracts research

PUBMED ID PMID:

MEDLINE DATE:

Rotationally Resolved IR-Diode Laser Studies of Ground-State CO(2) Excited by Collisions with Vibrationally Excited Pyridine. Journal Published:

PUBLICATION TYPE: Journal Article

Journal: The journal of physical chemistry. A

VOLUME: 112

Page Numbers: 2543-52

Journal Abbreviation:

ISSN: 1520-5215

DAY: 6

MONTH: 03

YEAR: 2008

Rotationally Resolved IR-Diode Laser Studies of Ground-State CO(2) Excited by Collisions with Vibrationally Excited Pyridine. Information

Number of References:

LANGUAGE: eng

NlmUniqueID: 9890903

Rotationally Resolved IR-Diode Laser Studies of Ground-State CO(2) Excited by Collisions with Vibrationally Excited Pyridine. Keywords Mesh Terms:

KEYWORDS:

MESH TERMS:

Chemical & Substance for Abstract: Rotationally Resolved IR-Diode Laser Studies of Ground-State CO(2) Excited by Collisions with Vibrationally Excited Pyridine. Information

Substance Name:

Registry Number:

Grant and Affiliation Information for Rotationally Resolved IR-Diode Laser Studies of Ground-State CO(2) Excited by Collisions with Vibrationally Excited Pyridine.

AFFILIATION: Department of Chemistry and Biochemistry, Brigham Young University, Provo, Utah 84602.

Country: United States

AGENCY:

GRANT:

ACRONYM:

MEDLINETA: J Phys Chem A

REFSOURCE:

DATABASENAME:

ACCESSION NUMBER:

Number Hits: 0

Rotationally Resolved IR-Diode Laser Studies of Ground-State CO2 Excited by Collisions with Vibrationally Excited Pyridine Related Publications

• Collisional Relaxation of the Three Vibrationally Excited Difluorobenzene Isomers by Collisions with CO(2): Effect of Donor Vibrational Mode.
• Competition between Photochemistry and Energy Transfer in UV-Excited Diazabenzenes. 4. UV Photodissociation of 2,3-, 2,5-, and 2,6-Dimethylpyrazine.
• Quenching of highly vibrationally excited pyrimidine by collisions with CO(2).
• Rotationally Resolved IR-Diode Laser Studies of Ground-State CO(2) Excited by Collisions with Vibrationally Excited Pyridine.