Quenching of highly vibrationally excited pyrimidine by collisions with CO(2).

Quenching of highly vibrationally excited pyrimidine by collisions with CO(2). Research Abstract Details 

Research Abstract Table of Contents

Jump to the:

Quenching of highly vibrationally excited pyrimidine by collisions with CO(2). Abstract Text:

Jeremy A Johnson,Andrew M Duffin,Brian J Hom,Karl E Jackson,Eric T Sevy,Jeremy A Johnson,Andrew M Duffin,Brian J Hom,Karl E Jackson,Eric T Sevy,

Relaxation of highly vibrationally excited pyrimidine (C(4)N(2)H(4)) by collisions with carbon dioxide has been investigated using diode laser transient absorption spectroscopy. Vibrationally hot pyrimidine (E(')=40 635 cm(-1)) was prepared by 248-nm excimer laser excitation, followed by rapid radiationless relaxation to the ground electronic state. The nascent rotational population distribution (J=58-80) of the 00(0)0 ground state of CO(2) resulting from collisions with hot pyrimidine was probed at short times following the excimer laser pulse. Doppler spectroscopy was used to measure the CO(2) recoil velocity distribution for J=58-80 of the 00(0)0 state. Rate constants and probabilities for collisions populating these CO(2) rotational states were determined. The measured energy transfer probabilities, indexed by final bath state, were resorted as a function of DeltaE to create the energy transfer distribution function, P(E,E(')), from E(')-E approximately 1300-7000 cm(-1). P(E,E(')) is fitted to a single exponential and a biexponential function to determine the average energy transferred in a single collision between pyrimidine and CO(2) and parameters that can be compared to previously studied systems using this technique, pyrazineCO(2), C(6)F(6)CO(2), and methylpyrazineCO(2). P(E,E(')) parameters for these four systems are also compared to various molecular properties of the donor molecules. Finally, P(E,E(')) is analyzed in the context of two models, one which suggests that the shape of P(E,E(')) is primarily determined by the low-frequency out-of-plane donor vibrational modes and one which suggests that the shape of P(E,E(')) can be determined by how the donor molecule final density of states changes with DeltaE.

Quenching of highly vibrationally excited pyrimidine by collisions with CO(2). Publishing Authors By Initials

JA Johnson,AM Duffin,BJ Hom,KE Jackson,ET Sevy,JA Johnson,AM Duffin,BJ Hom,KE Jackson,ET Sevy,

For similar abstracts research abstracts see: abstracts research

PUBMED ID PMID:

MEDLINE DATE:

Quenching of highly vibrationally excited pyrimidine by collisions with CO(2). Journal Published:

PUBLICATION TYPE: Journal Article

Journal: The Journal of chemical physics

VOLUME: 128

Page Numbers: 054304

Journal Abbreviation:

ISSN: 0021-9606

DAY: 7

MONTH: Feb

YEAR: 2008

Quenching of highly vibrationally excited pyrimidine by collisions with CO(2). Information

Number of References:

LANGUAGE: eng

NlmUniqueID: 375360

Quenching of highly vibrationally excited pyrimidine by collisions with CO(2). Keywords Mesh Terms:

KEYWORDS:

MESH TERMS:

Chemical & Substance for Abstract: Quenching of highly vibrationally excited pyrimidine by collisions with CO(2). Information

Substance Name:

Registry Number:

Grant and Affiliation Information for Quenching of highly vibrationally excited pyrimidine by collisions with CO(2).

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

Country: United States

AGENCY:

GRANT:

ACRONYM:

MEDLINETA: J Chem Phys

REFSOURCE:

DATABASENAME:

ACCESSION NUMBER:

Number Hits: 0

Quenching of highly vibrationally excited pyrimidine by collisions with CO2 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.