Incoherent broad-band cavity-enhanced absorption spectroscopy of azulene in a supersonic jet

Fiedler, Sven E.; Hoheisel, Gerald; Ruth, Albert A.; Hese, A.

doi:10.1016/j.cplett.2003.10.075

Cited by 38 publications

(44 citation statements)

References 15 publications

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“…The high-resolution absorption spectrum of the S 1 1 B 2 ← S 0 1 A 1 transition of jet-cooled azulene has been observed and the lifetime has been estimated to be ϳ1 ps by measuring the width of each vibronic band. [11][12][13][14][15] The direct real-time observation of femtosecond dynamics also revealed an ultrafast process on the time scale of 900 fs. 16 For the S 2 state, the vibronic structure has been analyzed by the fluorescence excitation spectrum and dispersed fluorescence spectrum for single vibronic level excitation in a supersonic jet using a nanosecond laser.…”

Section: Introductionmentioning

confidence: 96%

Rotationally resolved ultrahigh-resolution laser spectroscopy of the S2 A11←S A11 transition of azulene

Semba

Yoshida

Kasahara

et al. 2009

The Journal of Chemical Physics

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We have observed rotationally resolved ultrahigh-resolution fluorescence excitation spectra of the 0(0)(0) (a-type) and 0(0)(0)+467 cm(-1) (b-type) bands of the S(2) (1)A(1)<--S(0) (1)A(1) transition of jet-cooled azulene. The observed linewidth is 0.0017 cm(-1), which corresponds to the lifetime of 3.1 ns in the S(2) state. Zeeman splitting of rotational lines is very small so that intersystem crossing to the triplet state is considered to be very slow. Inertial defect is very small and the molecule is considered to be planar in the S(0) and S(2) states (C(2v) symmetry). Rotational constants of the S(2) state are almost identical to those of the S(0) state, indicating that geometrical structure is similar in both electronic states. In this case, internal conversion (IC) by vibronic coupling is thought to be inactive. Therefore, the main radiationless transition process in the S(2) (1)A(1) state of azulene was identified to be IC to the S(1) (1)B(2) state. However, this S(2)-->S(1) IC is still slower than that of conventional polycyclic aromatic hydrocarbons. We consider it to be due to the shallower potential energy curve in the S(1) (1)B(2) state, which is also responsible for the extraordinarily fast S(1)-->S(0) IC in the isolated azulene molecule.

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Section: Introductionmentioning

confidence: 96%

Rotationally resolved ultrahigh-resolution laser spectroscopy of the S2 A11←S A11 transition of azulene

Semba

Yoshida

Kasahara

et al. 2009

The Journal of Chemical Physics

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“…those techniques that utilise broad-band emission sources, are increasing in popularity where it is desirable either to measure several compounds simultaneously that absorb in different spectral regions or where specificity is required for target species with extended absorption features (such as relatively large molecules or surface/liquid-borne species). Several studies have been reported that combine different broad-band sources such as arc-lamps [1][2][3][4][5][6] and light emitting diodes (LEDs) [7][8][9][10][11][12] with dispersive and interferometric detection schemes to detect gas phase species such as iodine oxides, 5 NO x compounds, 7,8,10,11 and solutions containing dyes (e.g. coumarin 334, brilliant blue-R, and rhodamine B and 6G) 9,12,13 which absorb at visible wavelengths.…”

Section: Introductionmentioning

confidence: 99%

Near-infrared broad-band cavity enhanced absorption spectroscopy using a superluminescent light emitting diode

Denzer

Hamilton

Hancock

et al. 2009

Analyst

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A fibre coupled near-infrared superluminescent light emitting diode that emits $10 mW of radiation between 1.62 and 1.7 mm is employed in combination with a broad-band cavity enhanced spectrometer consisting of a linear optical cavity with mirrors of reflectivity $99.98% and either a dispersive near-infrared spectrometer or a Fourier transform interferometer. Results are presented on the absorption of 1,3-butadiene, and sensitivities are achieved of 6.1 Â 10 À8 cm À1 using the dispersive spectrometer in combination with phase-sensitive detection, and 1.5 Â 10 À8 cm À1 using the Fourier transform interferometer (expressed as a minimum detectable absorption coefficient) over several minutes of acquisition time.

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“…A conventional absorption spectrometer can easily be adapted for a CEAS setup with the addition of two mirrors forming a cavity around the sample (62). The use of a laser is not mandatory: Incoherent broadband (IBB) sources such as light-emitting diodes (LEDs) can also be used (63).…”

Section: Cavity-enhanced Absorption Spectroscopymentioning

confidence: 99%

Liquid-Phase and Evanescent-Wave Cavity Ring-Down Spectroscopy in Analytical Chemistry

Sneppen

Ariese

Gooijer

et al. 2009

Annual Rev. Anal. Chem.

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Due to its simplicity, versatility, and straightforward interpretation into absolute concentrations, molecular absorbance detection is widely used in liquidphase analytical chemistry. Because this method is inherently less sensitive than zero-background techniques such as fluorescence detection, alternative, more sensitive measurement principles are being explored. This review discusses one of these: cavity ring-down spectroscopy (CRDS). Advantages of this technique include its long measurement pathlength and its insensitivity to light-source-intensity fluctuations. CRDS is already a wellestablished technique in the gas phase, so we focus on two new modes: liquidphase CRDS and evanescent-wave (EW)-CRDS. Applications of liquidphase CRDS in analytical chemistry focus on improving the sensitivity of absorbance detection in liquid chromatography. Currently, EW-CRDS is still in early stages: It is used to study basic interactions between molecules and silica surfaces. However, in the future this method may be used to develop, for instance, biosensors with high specificity.

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Incoherent broad-band cavity-enhanced absorption spectroscopy of azulene in a supersonic jet

Cited by 38 publications

References 15 publications

Rotationally resolved ultrahigh-resolution laser spectroscopy of the S2 A11←S A11 transition of azulene

Rotationally resolved ultrahigh-resolution laser spectroscopy of the S2 A11←S A11 transition of azulene

Near-infrared broad-band cavity enhanced absorption spectroscopy using a superluminescent light emitting diode

Liquid-Phase and Evanescent-Wave Cavity Ring-Down Spectroscopy in Analytical Chemistry

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