Acta Phys. -Chim. Sin. ›› 1996, Vol. 12 ›› Issue (09): 786-795.doi: 10.3866/PKU.WHXB19960904

• ARTICLE • Previous Articles     Next Articles

Diode Laser Probing of NH3ν2 Vibrational Mode Excited by Relaxation of Highly Vibrational Exited NO2

Cai Ji-Ye,Liu Yi,Li Ya-Dong,Cheng Guo-Sheng,Zhang Wei,Zhang Bing,Zhou Shi-Kang,Gao Jun-Yi,Gong Zhi-Ben   

  1. Anhui Institute of Optics and Fine Mechanics,Academia Sinica,Hefei 230031
  • Received:1995-11-13 Revised:1996-05-06 Published:1996-09-15
  • Contact: Cai Ji-Ye

Abstract:

IR diode laser probing technique has been used to detect the vibrational energy transfer of NH3(ν2) excited by the relaxation of high energy NO2 molecule. NO2 was pumped by YAG 532nm laser. The time resolved absorption spectra of NH3(ν2) ro-vibronic levels were detected by diode laser. When the pressure ratios of NO2:NH3 were 1:5, 1:1, 2:1 and 5:1, the excited rate constants of NH3(0100;7,k) are 9.28×10-1, 6.42×10-1, 5.05×10-1,3.65×10-1 ms-1•Pa-1 respectively. The amount of energy transferred from excited NO2 to the ν2 mode of NH3 was found to be 6% of the original excitation energy. Most of the excitation energy was transferred to rotational and translational energy of NH3. The mechanism of vibrational excitation was discussed.

Key words: Diode laser probing, Highly vibrational excited molecule, Molecular collisional dynamics, Vibrational energy transfer, Rate constant