Alwahabi, Z.Zetterberg, J.Li, Z.Alden, M.2009-11-092009-11-092009Chemical Physics, 2009; 359(1-3):71-760301-0104http://hdl.handle.net/2440/52420We present experimental measurements of the vibrational relaxation of CO<inf>2</inf> (1 2<sup>0</sup> 1) by argon, at ambient temperature (295 ± 2 K). The CO<inf>2</inf> molecules were directly excited to the (1 2<sup>0</sup> 1, J = 14) ro-vibrational state by a tunable laser radiation at ∼2 μm. Time-resolved infrared fluorescence technique was used to study the collisional relaxation process. The bimolecular deactivation rate constant of CO<inf>2</inf> (1 2<sup>0</sup> 1) by argon was found to be (825 ± 43 Torr<sup>-1</sup> s<sup>-1</sup>) while the self-deactivation by CO<inf>2</inf> (0 0<sup>0</sup> 0) was determined to be (3357 ± 135 Torr<sup>-1</sup> s<sup>-1</sup>). The radiative life-time of the vibrational combination band (1 2<sup>0</sup> 1), τ[CO<inf>2</inf> (1 2<sup>0</sup> 1)], was found to be (5.55 ± 0.27) μs. Modern angular momentum theory was used to explain values of the deactivation rate measured. It is concluded that the presence of the (0 8<sup>0</sup> 0) state acts like an angular momentum sink leading to a fast deactivation rate of the CO<inf>2</inf> (1 2<sup>0</sup> 1) by argon. © 2009 Elsevier B.V. All rights reserved.en© 2009 Elsevier B.V. All rights reserved.Vibrational relaxationenergy transfertime-resolved IR fluorescenceVibrational relaxation of CO₂ (12⁰1) by argonVibrational relaxation of CO(2) (12 degrees 1) by argonJournal article002009086010.1016/j.chemphys.2009.03.0080002667564000122-s2.0-6544917497138754Alwahabi, Z. [0000-0003-4831-7798]