Thermal lens spectrophotometry based on pulsed laser excitation

Mori, Kenji; Imasaka, Totaro; Ishibashi, Nobuhiko

doi:10.1021/ac00249a029

Cited by 77 publications

(52 citation statements)

References 38 publications

(17 reference statements)

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“…This approach was called thermal lens spectrometry [12]. The relative sensitivity of conventional absorption spectrometry was reported for liquid and gas samples under CW and pulsed laser excitations, indicating that a pulsed laser is useful for trace analysis of gases and a CW laser for liquids [13,14]. Similarly, beam deflection resulting from the refractive index gradient was measured in thermal deflection spectrometry [15], and the beam diffraction resulting from an interference pattern thermally-induced by a crossed beam, was recorded in thermal grating spectrometry [16].…”

Section: Landmark Papers From the 1970'smentioning

confidence: 99%

Laser spectroscopy on organic molecules

Imasaka

1996

Analytical and Bioanalytical Chemistry

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Various laser spectrometric methods have been developed until now. Especially, laser fluorometry is most sensitive and is frequently combined with a separation technique such as capillary electrophoresis. For non-fluorescent compounds, photothermal spectrometry may be used instead. A diode laser is potentially useful for practical trace analysis, because of its low cost and long-term trouble-free operation. On the other hand, monochromaticity of the laser is essential in high-resolution spectrometry, e.g. in low temperature spectrometry providing a very sharp spectral feature. Closely-related compounds such as isomers can easily be differentiated, and information for assignment is obtained from the spectrum. Multiphoton ionization mass spectrometry is useful for soft ionization, providing additional information concerned with molecular weight and chemical structure. A short laser pulse with a sufficient energy is suitable for rapid heating of the solid surface. A matrix-assisted laser desorption/ion-ization technique is recently employed for introduction of a large biological molecule into a vacuum for mass analysis. In the future, laser spectrometry will be developed by a combination with state-of-the-art laser technology. In the 21st century, new laser spectrometry will be developed, which may be based on revolutionary ideas or unexpected discoveries. Such studies will open new frontiers in analytical laser spectroscopy.

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Section: Landmark Papers From the 1970'smentioning

confidence: 99%

Laser spectroscopy on organic molecules

Imasaka

1996

Analytical and Bioanalytical Chemistry

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“…The authors discussed the problems arising from the two-photon absorption of benzene which was used as solvent (Mori et al, 1982).…”

Section: Pulsed Excitationmentioning

confidence: 99%

“…The heat emitted is detected either with a piezoelectric transducer via the acoustic pulse generated (Pate1 and Tam, 1981), with a probe laser beam (Fuke et al, 1983;Mori et al, 1982;Rossbroich et al, 1985), or with an infrared detector (Tam, 1985).…”

Section: Introductionmentioning

confidence: 99%

Photo Acoustic and Photothermal Methods Applied to the Study of Radiationless Deactivation Processes in Biological Systems and in Substances of Biological Interest

Braslavsky

1986

Photochem & Photobiology

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“…The excess ~gy acquired by the molecule can be dissipated many ways. The non-radiative decay produces ::aIized temperature rise, creating a refractive kl gradient in the medium so that the medium a as a lens-like optical element, called thermal [6. The focal length of the induced thermal lens ,pulsed laser irradiation is given by [13,14]:…”

Section: Introductionmentioning

confidence: 99%

Thermal lens spectrum of organic dyes using optical parametric oscillator

Kurian

Unnikrishnan

George

et al. 2003

Spectrochimica Acta Part A: Molecular and Biomolecular Spectros

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The wavelength dependence of thermal lens signal from organic dyes are studied using dual beam thermal lens technique. It is found that the profile of thermal lens spectrum widely differ from the conventional absorption spectrum in the case of rhodamine B unlike in the case of crystal violet. This is explained on the basis of varying contribution of nonradiative relaxations from the excited vibronic levels.

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Thermal lens spectrophotometry based on pulsed laser excitation

Cited by 77 publications

References 38 publications

Laser spectroscopy on organic molecules

Laser spectroscopy on organic molecules

Photo Acoustic and Photothermal Methods Applied to the Study of Radiationless Deactivation Processes in Biological Systems and in Substances of Biological Interest

Thermal lens spectrum of organic dyes using optical parametric oscillator

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