Determination of ammonia using carbon dioxide laser photoacoustic spectroscopy compared with conventional spectrophotometry

The Analyst ◽  
1992 ◽  
Vol 117 (3) ◽  
pp. 379-382 ◽  
Author(s):  
Anikó M. Sólyom ◽  
György Z. Angeli ◽  
Dane D. Bicanic ◽  
Marcel Lubbers
Keyword(s):  
Carbon Dioxide ◽  
Photoacoustic Spectroscopy ◽  
Carbon Dioxide Laser ◽  
Laser Photoacoustic Spectroscopy

Measurement of the speed of light I. Introduction and frequency measurement of a carbon dioxide laser

1977 ◽  
Vol 355 (1680) ◽  
pp. 61-88 ◽  
Keyword(s):  
Carbon Dioxide ◽  
Carbon Dioxide Laser ◽  
Frequency Measurement ◽  
Laser Frequency ◽  
Absorption Cell ◽  
Speed Of Light ◽  
Centre Frequency ◽  
Harmonic Mixing

This, and part II following, describe a determination of the speed of light made by measuring the frequency and wavelength of radiation from a CO 2 laser. This laser was operated on the 9.3 μm R(12) transition, and stabilized by reference to fluorescence in an external CO 2 absorption cell. The laser frequency was measured via a sequence of harmonic-mixing stages involving the HCN and H 2 O lasers as transfer oscillators, and was found to be 32 176 079 482 ± 14 kHz ( ± 4.2 parts in 10 10 ). A correction to this value of — 10 kHz is necessary to obtain the centre frequency of the CO 2 reference transition. The wavelength measurements and value of c are described in part II.

scholarly journals Espectroscopia fotoacústica laser: cálculo de eficiência quântica radiativa do íon Nd3+ dopado em vidro soda-lime

1988 ◽  
Vol 10 (10) ◽  
pp. 07
Author(s):  
Gilson A.R. Lima
Keyword(s):  
Photoacoustic Spectroscopy ◽  
Incident Light ◽  
Soda Lime ◽  
Soda Lime Glass ◽  
Photoacoustic Effect ◽  
Effect Theory ◽  
Laser Photoacoustic Spectroscopy ◽  
Radiative Quantum Efficiency ◽  
Signal Intensities

Laser photoacoustic spectroscopy measurements of radiative quantum efficience were made on Nd3+ ion doped in soda-lime glass. The variations of signal intensities with chopping frequency of the incident light are in agreement with the predictions of standard photoacoustic effect theory. The determination of radiative quantum efficiency of this material is described using two differents wavelenght as a function of a fixed chopping frequency. The measured value n=0.87 + 0.04 is compared with those obtained by other methods.

Determination of sulfur dioxide by pulsed ultraviolet laser photoacoustic spectroscopy

1987 ◽  
Vol 59 (2) ◽  
pp. 300-304 ◽  
Author(s):  
P. Vujkovic. Cvijin ◽  
D. A. Gilmore ◽  
M. A. Leugers ◽  
G. H. Atkinson
Keyword(s):  
Sulfur Dioxide ◽  
Photoacoustic Spectroscopy ◽  
Ultraviolet Laser ◽  
Laser Photoacoustic Spectroscopy
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