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Picosecond transient Grating Spectroscopy: the Nature of the Diffracted Spectrum

Hoegemann, Claudia
Pauchard, Marc
Published in Review of Scientific Instruments. 1996, vol. 67, no. 10, p. 3449-3453
Abstract A ps transient grating setup using white light continuum for probing is presented. Measurements on an aromatic molecule in solution have been carried out with this system. The diffracted spectrum is analyzed using Kogelnik's coupled wave theory. At short time delay after excitation, the diffracted spectrum is strongly dominated by absorption and in this case transient grating spectroscopy is equivalent but more sensitive to transient absorption spectroscopy. If some of the excitation energy is dissipated as heat, the diffracted spectrum is essentially the same as the dispersion spectrum of the transient species at time delays approaching half the acoustic period. The performances of this technique and of transient absorption spectroscopy are compared.
Keywords Optical spectrometersVisible radiationTime resolutionPs rangeAbsorption spectraDiffractionTime delayAromaticsSolutesComparative evaluations
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Research group Groupe Vauthey
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HOEGEMANN, Claudia, PAUCHARD, Marc, VAUTHEY, Eric. Picosecond transient Grating Spectroscopy: the Nature of the Diffracted Spectrum. In: Review of Scientific Instruments, 1996, vol. 67, n° 10, p. 3449-3453. doi: 10.1063/1.1147157 https://archive-ouverte.unige.ch/unige:2983

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Deposited on : 2010-02-12

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