Absolute density measurement of SD radicals in a supersonic jet at the quantum-noise-limit

Mizouri, Arin; Deng, Lianzhong; Eardley, Jack S.; Nahler, N. Hendrik; Wrede, Eckart; Carty, David

doi:10.1039/c3cp53394h

Cited by 7 publications

(2 citation statements)

References 25 publications

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“…It could be verified using cavity-enhanced laser-induced fluorescence (CELIF) in a similar way to Mizouri et al 27 Calibration of the REMPI signal at high densities would yield an absolute density of trapped SH radicals.…”

Section: Discussionmentioning

confidence: 96%

Magnetic trapping of SH radicals

Eardley

Warner

Deng

et al. 2017

Phys. Chem. Chem. Phys.

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The full-text may be used and/or reproduced, and given to third parties in any format or medium, without prior permission or charge, for personal research or study, educational, or not-for-prot purposes provided that:• a full bibliographic reference is made to the original source • a link is made to the metadata record in DRO • the full-text is not changed in any way The full-text must not be sold in any format or medium without the formal permission of the copyright holders.Please consult the full DRO policy for further details. The molecular-beam speed was controlled by the mixing ratio of H2S in Kr to match the recoil velocity of the SH photofragments such that some SH radicals were produced with near-zero laboratory-frame velocity. The density of SH radicals in the 2 Π 3/2 , v = 0, J = 3/2 state was followed by (2+1) REMPI over seven orders of magnitude of signal intensity.5 ms after photodissociation, SH radicals moving faster than the capture velocity of 13 m/s had left the trap. The 1/e trap lifetime of the remaining SH radicals was 40 ± 10 ms at an estimated density of 5×10 4 molecules/cm 3 . Photostop offers a simple and direct way to accumulate absolute ground state molecules in a variety of traps.

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Section: Discussionmentioning

confidence: 96%

Magnetic trapping of SH radicals

Eardley

Warner

Deng

et al. 2017

Phys. Chem. Chem. Phys.

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“…[20] In recent years, a new method called cavity-enhanced laser-induced fluorescence (CELIF) has been described by Sanders et al, [21] and then used for measuring the absolute number density of SD radicals. [22] This method combines the absolute absorption capabilities of CRDS and the sensitivity of LIF. The CRDS data are used for normalizing the LIF signal to remove the influence of the laser intensity fluctuation.…”

Section: Introductionmentioning

confidence: 99%

Absolute density measurement of nitrogen dioxide with cavity-enhanced laser-induced fluorescence

Zhenghai¹,

Yang²,

Deng³

et al. 2018

Chinese Phys. B

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The absolute number density of nitrogen dioxide (NO 2 ) seeded in argon is measured with cavity-enhanced laserinduced fluorescence (CELIF) through using a pulsed laser beam for the first time. The cavity ring down (CRD) signal is acquired simultaneously and used for normalizing the LIF signal and determining the relationship between the measured CELIF signal and the NO 2 number density. The minimum detectable NO 2 density down to (3.6±0.1)×10 8 cm −3 is measured in 60 s of acquisition time by the CELIF method. The minimum absorption coefficient is measured to be (2.0±0.1)×10 −10 cm −1 , corresponding to a noise equivalent absorption sensitivity of (2.2±0.1)×10 −9 cm −1 •Hz −1/2 . The experimental system demonstrated here can be further improved in its sensitivity and used for environmental monitoring of outdoor NO 2 pollution.

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Absolute fluorescence and absorption measurements over a dynamic range of 106 with cavity-enhanced laser-induced fluorescence

Sanders

Willis

Nahler

et al. 2018

The Journal of Chemical Physics

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We present a novel spectroscopic technique that exhibits high sensitivity and a large dynamic range for the measurement of absolute absorption coefficients. We perform a simultaneous and correlated laser-induced fluorescence and cavity ring-down measurement of the same sample in a single pulsed laser beam. The combined measurement offers a large dynamic range and a lower limit of detection than either technique on its own. The methodology, dubbed cavity-enhanced laser-induced fluorescence, is developed and rigorously tested against the electronic spectroscopy of 1,4-bis(phenylethynyl)benzene in a molecular beam and density measurements in a cell. We outline how the method can be used to determine absolute quantities, such as sample densities, absorption cross sections, and fluorescence quantum yields, particularly in spatially confined samples.

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Absolute density measurement of SD radicals in a supersonic jet at the quantum-noise-limit

Cited by 7 publications

References 25 publications

Magnetic trapping of SH radicals

Magnetic trapping of SH radicals

Absolute density measurement of nitrogen dioxide with cavity-enhanced laser-induced fluorescence

Absolute fluorescence and absorption measurements over a dynamic range of 106 with cavity-enhanced laser-induced fluorescence

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