SiF2as a primary desorption product of Si etching by F atoms: Interpretation of laser‐induced fluorescence spectra; rate constant of the gas phase SiF2+F reaction

1991 ◽  
Vol 70 (7) ◽  
pp. 3892-3898 ◽  
Author(s):  
S. Vanhaelemeersch ◽  
J. Van Hoeymissen ◽  
D. Vermeylen ◽  
J. Peeters
Keyword(s):  
Gas Phase ◽  
Rate Constant ◽  
Fluorescence Spectra ◽  
Laser Induced Fluorescence

scholarly journals Laser-Induced-Fluorescence Spectrum of the CNN Molecule

1988 ◽  
Vol 9 (4-6) ◽  
pp. 359-368 ◽  
Author(s):  
M. C. Curtis ◽  
A. P. Levick ◽  
P. J. Sarre
Keyword(s):  
Low Temperature ◽  
Gas Phase ◽  
Fluorescence Spectra ◽  
Laser Excitation ◽  
Band System ◽  
Laser Induced Fluorescence ◽  
Rotational Spectrum ◽  
Spin Orbit ◽  
Electronic Band ◽  
Temperature Matrix

We have recorded a laser excitation spectrum of the A3Π–X3Σ− electronic band system of the CNN radical in the gas phase, at a resolution of ca. 0.8 cm−1. The rotational branch structure of the vibrational band near 419 nm has been simulated and molecular parameters are obtained. The results are compared with data from laser-induced-fluorescence spectra of CNN trapped in a low-temperature matrix. A revised value for the spin-orbit parameter in the A3Π state is obtained and comparison is made with the values for related molecules. The possible detection of CNN in astrophysical sources is considered and the general features of its rotational spectrum in the ground electronic state are described.

Fluorescence of BODIPY Dyes in Gas Phase at near Ambient Conditions

2020 ◽  
Author(s):  
Kseniya A. Mariewskaya ◽  
Denis Larkin ◽  
Yuri Samoilichenko ◽  
Vladimir Korshun ◽  
Alex Ustinov
Keyword(s):  
Gas Phase ◽  
Molecular Interactions ◽  
Atmospheric Pressure ◽  
Fluorescence Spectra ◽  
Visible Range ◽  
Intrinsic Properties ◽  
Ambient Conditions ◽  
Ideal Model ◽  
Molecular Fluorescence ◽  
Tesla Coil

Molecular fluorescence is a phenomenon that is usually observed in condensed phase. It is strongly affected by molecular interactions. The study of fluorescence spectra in the gas phase can provide a nearly-ideal model for the evaluation of intrinsic properties of the fluorophores. Unfortunately, most conventional fluorophores are not volatile enough to allow study of their fluorescence in the gas phase. Here we report very bright gas phase fluorescence of simple BODIPY dyes that can be readily observed at atmospheric pressure using conventional fluorescence instrumentation. To our knowledge, this is the first example of visible range gas phase fluorescence at near ambient conditions. Evaporation of the dye in vacuum allowed us to demonstrate organic molecular electroluminescence in gas discharge excited by electric field produced by a Tesla coil.

Effects of UV-B Radiation on Laser-Induced Fluorescence Spectra in Crop Leaves

2001 ◽  
Vol 22 (2) ◽  
pp. 151-155 ◽  
Author(s):  
K. Mineuchi ◽  
K. Takahashi ◽  
H. Tatsumoto
Keyword(s):  
Fluorescence Spectra ◽  
Laser Induced Fluorescence

Cervical Precancer Detection Using a Multivariate Statistical Algorithm Based on Laser-Induced Fluorescence Spectra at Multiple Excitation Wavelengths

1996 ◽  
Vol 64 (4) ◽  
pp. 720-735 ◽  
Author(s):  
Nirmala Ramanujam ◽  
Michele Follen Mitchell ◽  
Anita Mahadevan-Jansen ◽  
Sharon L. Thomson ◽  
Gregg Staerkel ◽  
...  
Keyword(s):  
Fluorescence Spectra ◽  
Laser Induced Fluorescence ◽  
Multivariate Statistical ◽  
Statistical Algorithm ◽  
Cervical Precancer

Reaction rate constant of SO3+ NH3in the gas phase

1990 ◽  
Vol 95 (D9) ◽  
pp. 13981 ◽  
Author(s):  
Gaunlin Shen ◽  
Masako Suto ◽  
L. C. Lee
Keyword(s):  
Gas Phase ◽  
Rate Constant ◽  
Reaction Rate ◽  
Reaction Rate Constant

scholarly journals Ruthenium trisbipyridine as a candidate for gas-phase spectroscopic studies in a Fourier transform mass spectrometer

2004 ◽  
Vol 18 (2) ◽  
pp. 387-396 ◽  
Author(s):  
Jill R. Scott ◽  
Jason E. Ham ◽  
Bill Durham ◽  
Paul L. Tremblay
Keyword(s):  
Fourier Transform ◽  
Gas Phase ◽  
Mass Spectrometer ◽  
Rate Constant ◽  
Optical Detection ◽  
Sinapinic Acid ◽  
Spectroscopic Studies ◽  
Fluorescence Lifetimes ◽  
Fourier Transform Mass Spectrometer

Metal polypyridines are excellent candidates for gas-phase optical experiments where their intrinsic properties can be studied without complications due to the presence of solvent. The fluorescence lifetimes of [Ru(bpy)3]1+trapped in an optical detection cell within a Fourier transform mass spectrometer were obtained using matrix-assisted laser desorption/ionization to generate the ions with either 2,5-dihydroxybenzoic acid (DHB) or sinapinic acid (SA) as matrix. All transients acquired, whether using DHB or SA for ion generation, were best described as approximately exponential decays. The rate constant for transients derived using DHB as matrix was 4×107s−1, while the rate constant using SA was 1×107s−1. Some suggestions of multiple exponential decay were evident although limited by the quality of the signals. Photodissociation experiments revealed that [Ru(bpy)3]1+generated using DHB can decompose to [Ru(bpy)2]1+, whereas ions generated using SA showed no decomposition. Comparison of the mass spectra with the fluorescence lifetimes illustrates the promise of incorporating optical detection with trapped ion mass spectrometry techniques.

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