An experimental study of the intersystem crossing and reactions of C2(X1Sigmag+) and C2(a3Pi(u)) with O2 and NO at very low temperature (24-300 K)

The Journal of Physical Chemistry. a
Alejandra PáramoIan R Sims

Abstract

A low-temperature gas-phase kinetics study of the reactions and collisional relaxation processes involving C2(X1Sigma(g)+) and C2(a3Pi(u)) in collision with O2 and NO partners at temperatures from 300 to 24 K is reported. The experiments employed a CRESU (Cinétique de Réaction en Ecoulement Supersonique Uniforme) apparatus to attain low temperatures. The C2 species were created using pulsed laser photolysis at 193 nm of mixtures containing C2Cl4 diluted in N2, Ar, or He carrier gas. C2(X1Sigma(g)+) molecules were detected via pulsed laser-induced fluorescence in the (D1Sigma(u)+ <-- X1Sigma(g)+) system, and C2(a3Pi(u)) molecules were detected via pulsed laser-induced fluorescence in the (d 3Pi(g) <-- a 3Pi(u)) system. Relaxation of 3C2 by intersystem crossing induced by oxygen was measured at temperatures below 200 K, and it was found that this process remains very efficient in the temperature range 50-200 K. Reactivity of C2(X1Sigma(g)+) with oxygen became very inefficient below room temperature. Using these two observations, it was found to be possible to obtain the C2(X1Sigma(g)+) state alone at low temperatures by addition of a suitable concentration of O2 and then study its reactivity with NO without any interference comin...Continue Reading

References

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Jul 23, 2004·The Journal of Chemical Physics·Cunshun HuangYang Chen
Jul 13, 2006·The Journal of Physical Chemistry. a·Cunshun HuangYang Chen

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Citations

Sep 28, 2010·The Journal of Chemical Physics·Renzhi HuYang Chen
May 6, 2010·The Journal of Chemical Physics·Renzhi HuYang Chen
Jun 30, 2010·Physical Chemistry Chemical Physics : PCCP·Michel Costes, Christian Naulin
Oct 31, 2012·Journal of Molecular Modeling·Rui-Ping HuoChia-Chung Sun
Feb 7, 2008·Physical Chemistry Chemical Physics : PCCP·Nicolas DaugeyKevin M Hickson
Jun 11, 2014·Physical Chemistry Chemical Physics : PCCP·Jean-Christophe LoisonDaiqian Xie

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