Results 221 to 230 of about 357,235 (264)

Laser NO_2 fluorescence measurements in flames

Applied Optics, 1978
NO(2) fluorescence measurements have been made in a CH(4)/O(2)/N(2) flame at atmospheric pressure using a pulsed tunable dye laser. The results indicate that it should be possible to achieve sub-ppm sensitivities for NO(2) in flames using currently available lasers.
R H, Barnes, J F, Kircher
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Laser induced fluorescence spectroscopy of NC3O

The Journal of Chemical Physics, 2008
Laser induced fluorescence spectra of the NC3O radical in a supersonic jet have been observed. The radical was produced in a pulsed electric discharge of HC3N and O2 diluted to 0.3% with Ar. A total of 17 vibronic bands with a radiative lifetime of ∼30ns have been observed in a region from 27000to27500cm−1. The observed vibronic bands are classified as
Takashi, Yoshikawa, Yoshihiro, Sumiyoshi, Hideyuki, Takada, Kennosuke, Hoshina, Yasuki, Endo   +4 more
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Laser-induced multiphoton fluorescence of hemoglobin

Journal of Photochemistry and Photobiology B: Biology, 1988
Hemoglobin (Hb) and other samples were irradiated by the 1064 nm nanosecond pulses of an Nd:YAG laser. At room temperature, we observed two red fluorescence bands, which resulted from the absorption of two 1064 nm photons in Hb, and measured the fluorescence emission spectra in the red spectral region for Hb and hematoporphyrin derivative.
J R, Zhang, Y W, Xu, Y M, Deng, C K, Wu, S P, Jiang, S H, Lian   +5 more
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Laser-induced fluorescence spectroscopy of NC3S

The Journal of Chemical Physics, 2004
In a discharged supersonic jet of acetonitrile and carbon disulfide, we have for the first time observed an electronic transition of the NC3S radical using laser-induced fluorescence (LIF) spectroscopy. A progression originating from the C–S stretching mode of the upper electronic state appears in the excitation spectrum.
Masakazu, Nakajima, Yu, Yoneda, Yoshihiro, Sumiyoshi, Yasuki, Endo   +3 more
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Effect of velocity on microdroplet fluorescence quantified by laser-induced fluorescence

Lab Chip, 2014
Using a split laser, we analysed how the velocity of in-flow microdroplets modifies the droplet fluorescence signal when interrogated by LIF.
Benjamín, Vazquez, Naser, Qureshi, Laura, Oropeza-Ramos, Luis F, Olguin   +3 more
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Laser-Induced Fluorescence Spectroscopy in Flames

Progress in Energy and Combustion Science, 1980
The use of laser induced fluorescence spectroscopy (LIF) is described for making measurements in the combustion environment. Some background in molecular structure, spectroscopic concepts, thermodynamics and combustion chemistry is first presented. This is followed by application of the rate equations to model and demonstrate the response of atomic and
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Using a Diode Laser for Laser-Induced Fluorescence

Journal of Chemical Education, 2001
The construction and use of a laser fluorimeter from a 635-nm red diode laser and an amplified photodiode detector are described. The low cost and monochromatic nature of diode lasers make them attractive as excitation sources for educational fluorescence experiments. Use of this type of fluorimeter is demonstrated by measuring fluorescence signals for
Yang Tran, J. E. Whitten
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A laser velocimeter utilizing laser-induced fluorescence

Applied Physics Letters, 1975
Addition of a fluorescent dye to the liquid used for scattering particle production in a laser Doppler velocimeter can result in a number of practical advantages. An investigation of this concept has been carried out using various dyes and solvents to determine its potential and limitations.
Warren H. Stevenson, Reginaldo dos Santos, Stephen C. Mettler   +2 more
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Forensic Analysis of Laser Printed Ink by X-ray Fluorescence and Laser-Excited Plume Fluorescence

Analytical Chemistry, 2013
We demonstrated a minimally destructive two-tier approach for multielement forensic analysis of laser-printed ink. The printed document was first screened using a portable-X-ray fluorescence (XRF) probe. If the results were not conclusive, a laser microprobe was then deployed.
Po-Chun, Chu, Bruno Yue, Cai, Yeuk Ki, Tsoi, Ronald, Yuen, Kelvin S Y, Leung, Nai-Ho, Cheung   +5 more
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Laser-Induced Fluorescence of Biological Molecules

1976
A study is made of the laser-induced fluorescence properties of the complex formed by Quinacrine Mustard bound to Deoxyribonucleic Acid (DNA). Specific information is obtained on the binding mechanisms and on the base-pair sequences of the DNA. The relevance of these measurements in several fields from chemical physics to biology and medecine is ...
A. ANDREONI, LONGONI, ANTONIO FRANCESCO, C. A. SACCHI, O. SVELTO, G. BOTTIROLI   +4 more
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