How do characterize unstable sulfur compounds?

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Jürgen Weippert

Of course it's not a full characterization, but you could see if you can get access to a cold-spray ionization setup so you can do mass spectrometry and eventually MS-MS or IMS:

Article Cold-spray Ionization Mass Spectrometry: Principle and Applications

Arvind Singh Chauhan

Dear Sir,

If your compound has low molecular weight and has volatile nature, you can detect the compounds by simple GC-MS or headspace GC-MS.