Photodissociation of dimethyl sulfide at 227.5 nm: resonance-enhanced multiphoton ionization of the methyl fragment

• Published in: Chemical physics letters Vol. 311; no. 3; pp. 159 - 166
• Main Authors: Martı́nez-Haya, B., Zapater, I., Quintana, P., Menéndez, M., Verdasco, E., Santamarı́a, J., Bañares, L., Aoiz, F.J.
• Format: Journal Article
• Language: English
• Published: Elsevier B.V 24-09-1999
• ISSN: 0009-2614; 1873-4448
• DOI: 10.1016/S0009-2614(99)00855-6

The photodissociation of CH
3–S–CH
3 following the lowest dipole-allowed transition
1
1
B
1(9a
1←3b
1)←X
1
A
1 has been studied. The CH
3 photofragment has been detected by 2+1 resonance-enhanced multiphoton ionization through the 3p
z
2
A
2′′←X
2
A
2′′ and 4p
z
2
A
2′′←X
2
A
2′′ Rydberg transitions. The vibronic spectrum corresponding to the
ν
2 `umbrella' mode of CH
3 has been measured and fragments with
ν
2=0 to
ν
2=4 quanta of vibrational excitation have been detected. From the analysis of the 4p
z
rotationally resolved 0
0
0 band of CH
3, rotational temperatures
T
N
=325±75 K and
T
K
=125±50 K have been obtained for the ground vibrational state of the nascent CH
3 fragment.