Author: Androes G.M.
Publisher: Taylor & Francis Ltd
ISSN: 1362-3028
Source: Molecular Physics, Vol.15, Iss.3, 1968-01, pp. : 291-303
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Abstract
The high resolution spectrum of methylene violet in alkaline ethanol has been studied. The spectrum obtained using an X-band spectrometer appears to be anomalous in that one group of lines is unexpectedly broad, of low amplitude and has a temperature-dependent width which is completely different from that of all of the other lines in the spectrum. By combining the X-band results with those obtained from the same radical at the Q-band some of these apparent anomalies can be given a qualitative explanation. One anomaly remains unexplained; namely that the broad lines in the X-band spectrum also appear to have less area under their absorption curve than is to be expected on a statistical basis. (The Q-band spectrum seems to support this contention, but no quantitative information can be derived from it.) The ratio of the area under a broad line to that under an equivalent normal line is determined as a function of temperature. In the temperature range 0 to 85°C this ratio varies between 0·5 and 0·85. Statistically this ratio should be one, and independent of temperature. The method of determining area ratios was examined and shown to have an inaccuracy at room temperature of about 10 per cent which is comparable with the experiment error. Two possible mechanisms for producing the real or apparent discrepancies in the area were considered. It was concluded that neither was capable of producing those observed.
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