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Nanosecond time-resolved emission spectroscopy. 1La band excitation of styrenes

✍ Scribed by R.P. Steer; M.D. Swords; P.M. Crosby; D. Phillips; K. Salisbury

Publisher
Elsevier Science
Year
1976
Tongue
English
Weight
362 KB
Volume
43
Category
Article
ISSN
0009-2614

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✦ Synopsis

Non-cxponcntial decay of fluorescence from low pressure vapours of styrenc, alkyl styrenes and indcne, following cxcitation in the intense *La ('Al -'Al) band have been observed using a conventional single-photon-counting tcchnjquc. Time rcsolvcd emissicn spectra, using a frequency doubled, cavity dumped Ar+ laser (A excitation = 257.25 nm), have r* vedlcd the prcscncc of two cmrtting states. One of thcsc statcs is charactcrircd by an unusually lam: lifetime. Suzgcstions as to the nature of both the short and long-hvcd cmittinp states YC put forward.

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