Multiphoton dissociation/ionisation of dimethyl sulphide (CH3SCH3) at 355 and 532 nm

Journal of Chemical Sciences

Rajesh K Vatsa¹  Jai P Mittal¹  Chiranjib Majumder¹  Shailendra K Kulshreshtha1¹  Onnattu D Jayakumar¹ 

[1] Novel Materials and Structural Chemistry Division, Bhabha Atomic Research Centre, Mumbai 400 085, India$$

关键词: Dimethyl sulphide;    multiphoton ionization;    time-of-flight mass spectroscopy.;   

DOI  :  

来源: Indian Academy of Sciences

【 摘 要 】

Multiphoton dissociation/ionization has been studied for CH3SCH3 at 355 and 532 nm using a time-of-flight mass spectrometer. The major ion signals observed at 355 nm are C+, CH$_{3}^{+}$, HCS+, CH2S+, CH3S+ and CH3SCH$_{3}^{+}$. Power dependence studies at 355 nm show a (2 + 1) REMPI process for the formation of parent ion. Peaks at 𝑚/𝑒 = 46, 47 and 61 show two-photon laser power dependence whereas 𝑚/𝑒 = 15 and 45 peaks show four-photon dependence. However, in 532 nm photoionisation, no parent ion signal is observed. A peak at 𝑚/𝑒 = 35 corresponding to SH$_{3}^{+}$ has been observed. SH$_{3}^{+}$ has been suggested to originate from CH3SCH$_{2}^{+}$ via a cyclic transition state. Photoionisation results of CH3SCH3 have been compared with those of CH3SSCH3, at these two wavelengths.

【 授权许可】

Unknown