• Search Research Projects
  • Search Researchers
  • How to Use
  1. Back to previous page

Development of a kinetic analysis to elucidate the dynamics chemical reactions

Research Project

Project/Area Number 08454181
Research Category

Grant-in-Aid for Scientific Research (B)

Allocation TypeSingle-year Grants
Section一般
Research Field Physical chemistry
Research InstitutionNiigata University

Principal Investigator

YAMASAKI Katsuyoshi  Niigata University, Faculty of Science , Associate Professor, 理学部, 助教授 (90210385)

Project Period (FY) 1996 – 1997
Project Status Completed (Fiscal Year 1997)
Budget Amount *help
¥6,800,000 (Direct Cost: ¥6,800,000)
Fiscal Year 1997: ¥2,200,000 (Direct Cost: ¥2,200,000)
Fiscal Year 1996: ¥4,600,000 (Direct Cost: ¥4,600,000)
KeywordsReaction rate constant / Vibrational relaxation / Laser-induced fluorescence / Linear analysis / レーザ励起蛍光 / 振動分布
Research Abstract

A new method has been developed to determine the branching ratios between reactive removal and vibrational relaxation. The method needs information on neither photochemical parameters nor relative detectivities of vibrational levels of interest. We applied the method to analyze the time-dependent profiles of the laser-induced fluorescence (LIF) signals of OH (X^2PI_i, upsiron=OMICRON -4) produced in the reactions O (^1D) +CH_4 and O (^1D) +NH_3. The OH (upsiron) were deteced by LIF excited via A^2SIGMA^+-X^2PI_i transitions of the sequences DELTAupsiron=OMICRON (upsiron^"=0,1, and 2) and DELTAupsiron=-3 (upsiron^"=3 and 4). The rate constants for the reactive removal of OH by CH_4 were determined to be kappa (upsiron=1) =1.8*10^<-13> and kappa (upsiron=2) =1.0*10^<-12> cm^3 molecule^<-1> s^<-1>, and those of OH (upsiron) by NH_3 were kappa upsiron=1) =8.4*10^<-12> and kappa (upsiron=2) =6.4*10^<-11> cm^3 molecule^<-1> s^<-1>. Rate constants for vibrational relaxation of OH (upsiron) +CH_4 * OH (upsiron-1) +CH_4 were kappa (upsiron=1) =4.2*10^<-13> and kappa (upsiron=2) =1.3*10^<-12> cm^3 molecule^<-1> s^<-1>, and those of OH (upsiron) +NH_3 were kappa (upsiron=1) =2.5*10^<-11> and kappa (upsiron=2) =6.4*10^<-11> cm^3 molecule^<-1> s^<-1>. Reactive removal of OH (upsiron=1) by CH_4 was 29 times faster than that for OH (upsiron=OMICRON) ; that of OH (upsiron=1) by NH_3 was accelerated by a factor of 52. The ratio of the reactive removal OH (upsiron=2) /OH (upsiron=1) was 5.6 for the reaction with CH_4, and 7.6 for that with NH_3. It has also been found that reactive processes (reactions) are more enhanced than physical processes (relaxation) by a vibrational excitation. This is the first report on the determination of the branching ratios between chemical reaction and vibrational relaxation.

Report

(3 results)
  • 1997 Annual Research Report   Final Research Report Summary
  • 1996 Annual Research Report
  • Research Products

    (7 results)

All Other

All Publications (7 results)

  • [Publications] Katsuyoshi Yamasaki: "Application of a new method to the determination of rate constants: Examination of the effect of noise on the data" Interrational Journal of Chemical Kinetics. 30. 47-54 (1998)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1997 Final Research Report Summary
  • [Publications] Katsuyoshi Yamasaki: "A new method of determining the rate constants for state-to-state vibrational relaxation: An integrated profiles method" Bulletin of the chemical Society of Japan. 70. 89-95 (1997)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1997 Final Research Report Summary
  • [Publications] Katsuyoshi Yamasaki: "Application of a new method to the determination of the rate constants : Examination of the effect of noise the data" International Journal of Chemical Kinetics. 30. 47-54 (1998)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1997 Final Research Report Summary
  • [Publications] Katsuyoshi Yamasaki: "A new method of determining the rate constants for state-to-state vibrational relaxation : an integrated profiles method" Bulletin of Chemical Society of Japan. 70 (1). 89-95 (1997)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1997 Final Research Report Summary
  • [Publications] Katsuyoshi Yamasaki: "Application of a new method to the determination of rate constants : Examination of the effect of noise an the data" International Journal of Chemical Kinetics. 30. 47-54 (1998)

    • Related Report
      1997 Annual Research Report
  • [Publications] Katsuyoshi Yamasaki: "A new method of determining the rate constants for stateto - state vibrational relaxation : an integrated profiles method" Bulletin of the Chemical Society of Japan. 70・1. 89-95 (1997)

    • Related Report
      1997 Annual Research Report
  • [Publications] 山さき勝義: "A new method of determining the rate constants for state-to-state vibrational relaxation : an integrated profiles method" Bulletin of the Chemical Society of Japan. 70・1. 89-95 (1997)

    • Related Report
      1996 Annual Research Report

URL: 

Published: 1996-04-01   Modified: 2016-04-21  

Information User Guide FAQ News Terms of Use Attribution of KAKENHI

Powered by NII kakenhi