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Zeeman effect and singlet-triplet absorption spectrum of p-benzoquinone single crystals

✍ Scribed by H.P. Trommsdorff

Publisher: Elsevier Science
Year: 1967
Tongue: English
Weight: 271 KB
Volume: 1
Category: Article
ISSN: 0009-2614
DOI: 10.1016/0009-2614(67)85053-x

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✦ Synopsis

The singlet-triplet absorption spectrum of p-Benzoquinone single crystals at 200K and 4.2oK as well as the Zeeman splitting of some of its bands is reported and discussed. The pure electronic transition is shown to be located at 18619.5 cm-1 with 9Au symmetry in the excited state. The singlet-triplet n-s* t.?%nSitiGn of p-Benzoquinone (PBQ) has been observed under various conditions: In vapour phase PBQ exhibits a magnetic rotation .spectrurn in a band at 18682 cm-1 [l], an absorption spectrum with the O-O band at 18682.08 cm-1 [2], and an emission spectrum witn the O-O band at 18683 cm -1 [3]. In liquid solution of n-hexane a maximum of sbsorptlon at 18530 cm-1 has been measured [a]. In the pure crystal Sidman [5] located the origin of the S-T spectrum at 19942 Cm-1 and Chowdhury and McClure [6] reported the Zeeman splitting of this same band.

Hollas and Goodman [7] have discussed all available experimental evidence and identified &Lhis transition as 3Au-IAg.

A re-examination of the S-T crystal spectrum at temperatures of 200K and 4.2oK and the Zeeman splitting of some of the bands will be reported here.

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