Saturation effects in gas-phase photothermal deflection spectrophotometry.

Saturation effects in gas-phase photothermal deflection spectrophotometry.
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气相光热偏转分光光度法中的饱和效应。

DOI:
10.1021/ac00283a026
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发表时间:
1985
影响因子:
7.4
通讯作者:
Bialkowski,SE
Bialkowski,SE
中科院分区:
化学1区
文献类型:
--
作者:
Long,GR;Bialkowski,SE

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This paper describes some effects of optical saturation on a photothermal deflection signal and presents a simple theory to describe these effects. These effects Increase the sen-sitivity while decreasing the relative error of the method as the Intensity exceeds the saturation Intensity. Detection limits of 1.3 ppbvfor chlorodlfluoromethane, 2 ppbvfor dlchlorodlfluoromethane, and 3 ppmv for sulfur dioxide, In 13.3 kPa of argon, are found. These detection limits extrapolate to atmospheric detection limits of170 pptvfor chlorodlfluoromethane and 260 pptv for dlchlorodlfluoromethane. The corresponding mass detection limits In the Infrared laser Ir-radiated volume are 55 fg for chlorodlfluoromethane and 70 fg for dlchlorodlfluoromethane.Photothermal deflection spectrophotometry (PDS) is One of a class of several techniques that is used to measure small absorbances by probing the refractive index gradient created in the sample when absorption of radiation and subsequent thermal relaxation occurs(1, 2). PDS employs a pump laser operating on a frequency resonant with an absorption of the analyte to produce a temperature gradient in the sample. The
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