Optotermične metode za raziskovanje vzorcev z visoko absorpcijo in v prisotnosti motečega sipanja : doktorska disertacija = Photothermal methods for investigation of highly absorbing and scattering samples : dissertation
Močnik, Griša
We experimentally tested a newly developed theoretical model describing simultaneous thermal lens and beam deflection phenomena. The effect of both beam deflection on thermal lens measurements and ...that of the thermal lens on beam deflection measurements were investigated. The experiment confirmed the validity of theoretical predictions in studies of strongly absorbing samples for which the assumption of unchanged pump beam in the sample still holds. The potential of a dual beam thermal lens spectrometry used as a detector of the infrared absorption behind a HPLC column was investigated at CO laser wavelengths for the first time. Feasibility study of the thermal lens detection in a flowing medium with high background absorption was carried out. Mono- and polyunsaturated fatty acids in the model mixture were resolved without the need for their derivatization. We conducted a similar experiment for fatty acid methyl esters. The performance of the novel scheme was compared to that obtainable by the refractive index detector and the UV absorbance detector. The advantage of the thermal lens detection, when coeluting compounds such as fatty acids and alcohols are present, was demonstrated for the first time. We determined the depth profiles of dyes in the silica-gel on thin-layer chromatography plates. We performed pulsed photothermal radiometric measurements to obtain the thermal diffusivity and effusivity of the silica-gel. The newly proposed inversion of the data collected using photoacoustic measurements with modulated excitation yielded the depth profiles. Most of the dye was found within the upper half of the silica-gel layer.
Vrsta gradiva - disertacija
; neleposlovje za odrasle
Založništvo in izdelava - Ljubljana : [G. Močnik], 2002
GS II 0000546610 glavno skladišče
GS II 546610 glavno skladišče
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