Photodissociation of dimethyl sulfide at 227.5 nm: resonance-enhanced multiphoton ionization of the methyl fragment
1999; Elsevier BV; Volume: 311; Issue: 3-4 Linguagem: Inglês
10.1016/s0009-2614(99)00855-6
ISSN1873-4448
AutoresBruno Martı́nez−Haya, I. Zapater, P. Quintana, M. Menéndez, E. Verdasco, J. Santamarı́a, Luis Bañares, F. J. Aoiz,
Tópico(s)Spectroscopy and Laser Applications
ResumoThe photodissociation of CH3–S–CH3 following the lowest dipole-allowed transition 11B1(9a1←3b1)←X1A1 has been studied. The CH3 photofragment has been detected by 2+1 resonance-enhanced multiphoton ionization through the 3pz2A2′′←X2A2′′ and 4pz2A2′′←X2A2′′ Rydberg transitions. The vibronic spectrum corresponding to the ν2 `umbrella' mode of CH3 has been measured and fragments with ν2=0 to ν2=4 quanta of vibrational excitation have been detected. From the analysis of the 4pz rotationally resolved 000 band of CH3, rotational temperatures TN=325±75 K and TK=125±50 K have been obtained for the ground vibrational state of the nascent CH3 fragment.
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