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I am looking for the absorption spectrum of THT. What is the best way to find these types of exotic material's spectral characteristics?

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A good source of spectroscopic data is the NIST Chemistry WebBook. It compiles all possible information about polyatomic molecules including their UV/Vis and IR spectra. You will find references to corresponding papers and, as I see, the new version includes a Java applet that plots the UV spectrum. Here is a direct link to THT spectrum.

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I checked and cannot see the IR spectrum. Is there any other source I can go and look at. Google doesn't turn up anything useful. –  Frank Jan 11 '12 at 14:45
    
@Frank: Google is usually not very useful in finding scientific papers, it is better to use a specialized search engine like Web of Science. However, if you try alternative names of THT (see NIST page), then even with Google you will succeed with a query "Thiacyclopentane infrared" leading to J. R. Durig et al, “Microwave, Infrared and Raman Spectra of Thiacyclopentane,” J. Mol. Struct., 142, 53 (1986). Probably, you'll need to go to a library to get this paper. –  gigacyan Jan 24 '12 at 9:22

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