Acta Phys. -Chim. Sin. ›› 2000, Vol. 16 ›› Issue (04): 374-378.doi: 10.3866/PKU.WHXB20000416

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Resonance-enhanced Multiphoton lonization (REMPI) Spectrum of CH Radical

Pei Lin-Sen, Jin Jin, Gao Yi-De, Chen Cong-Xiang, Chen Yang   

  1. Department of Chemical Physics,Open Laboratory of Band Selective Chemistry,University of Science and Technology of China,Hefei 230026
  • Received:1999-07-19 Revised:1999-11-08 Published:2000-04-15
  • Contact: Chen Yang


CH radicals were prepared by photolysis of CHBr3 molecule, and were ionized by the same laser. Monitoring CH+, C+ and H+ ions signals, the CH REMPI spectrum was obtained in the range of 241-251nm.The CH D2Π(v=2)←A2Δ(v=0)(1+1) resonance transition was assigned. The rotational constants of CH D2Π(v=2) state were obtained by analyzing the REMPI spectrum. It was found that there is a broad feature peak at 247.6nm in C+ mass-specific spectrum. Based on the theoretical result, the broad feature peak is correlated with an unreported predissociation Rydberg state (3 2Π) which converges to CH+(A,1Π) state.

Key words: CH radical, REMPI, Laser photolysis