Diode laser spectroscopy of the atmospheric oxygen band

1990 ◽  
Vol 68 (3) ◽  
pp. 313-316 ◽  
Author(s):  
Hideto Kanamori ◽  
Morihisa Momona ◽  
Katsumi Sakurai
Keyword(s):  
Magnetic Field ◽  
Diode Laser ◽  
Atmospheric Oxygen ◽  
Zeeman Effect ◽  
High Resolution Spectrum ◽  
Laser Absorption ◽  
Diode Laser Spectroscopy ◽  
Low Magnetic Field ◽  
Diode Laser Absorption ◽  
Oxygen Band

The atmospheric oxygen band due to magnetic dipole transitions was studied by a diode laser absorption spectroscopy combined with a Zeeman modulation technique. The high-resolution spectrum of the 0–0 band was observed with Doppler-limited resolution and compared with a previous spectrograph measurement. The Zeeman effect at low magnetic field was investigated by the Zeeman line profiles. It was found that the second-order Zeeman effect was observable in the F2 transition of the [Formula: see text] state with magnetic field as low as 150 G.

Gaseous Contaminant Measurement for Semiconductor Processing by Diode Laser Spectroscopy

1995 ◽  
Vol 38 (5) ◽  
pp. 22-29
Author(s):  
James McAndrew ◽  
Ronald Inman ◽  
Benjamin Jurcik
Keyword(s):  
Diode Laser ◽  
Fluid Dynamic ◽  
Air Separation ◽  
Tunable Diode Laser ◽  
Laser Absorption ◽  
Diode Laser Spectroscopy ◽  
Diode Laser Absorption ◽  
Gaseous Contaminant

Tunable diode laser absorption spectroscopy (TDLAS) is a novel tool for purity measurement in microelectronic process gases and environments. It is compatible with any matrix gas and extremely sensitive. This paper describes the application of a laboratory TDLAS instrument to measurement of CO, CO2, and H2O with sub-ppb sensitivity, including determination of a CO level of 0.35± 0.2 ppb in nitrogen samples from an air separation plant. Fluid dynamic simulation was used to optimize the design of the cell used for H20 measurements. TDLAS lends itself to the study of contamination sources in situ. As examples, measurements of CO generation in sampling vessels and of CO2 outgassing in an electropolished stainless steel chamber are briefly discussed.

scholarly journals Measurement of the Magnetic Field in a Linear Magnetized Plasma by Tunable Diode Laser Absorption Spectroscopy

Atoms ◽  
2019 ◽  
Vol 7 (2) ◽  
pp. 48 ◽  
Author(s):  
Sven Dickheuer ◽  
Oleksandr Marchuk ◽  
Tsanko Tsankov ◽  
Dirk Luggenhölscher ◽  
Uwe Czarnetzki ◽  
...  
Keyword(s):  
Magnetic Field ◽  
Absorption Spectrum ◽  
Diode Laser ◽  
Absorption Spectroscopy ◽  
Magnetized Plasma ◽  
Tunable Diode Laser ◽  
Laser Absorption Spectroscopy ◽  
Laser Absorption ◽  
Diode Laser Absorption ◽  
The Magnetic Field

Tunable diode laser absorption spectroscopy (TDLAS) is a commonly used technique to measure the temperature and density of atoms or molecules in a gas. In this work, we demonstrate that the TDLAS diagnostics could be effectively applied to measure the magnetic field in a low-density weakly magnetized plasma using the Zeeman splitting of the absorption spectrum of lines from noble gases. The laser wavelength is tailored to fit the 1 s 5 → 2 p 6 transition of atomic Ar with the wavelength λ = 763.51 nm . Two mechanisms of line broadening and splitting are observed: Doppler broadening and Zeeman effect. The latter is especially pronounced by applying polarization-selective observation of the absorption to the TDLAS measurements. By fitting the σ and π components of the absorption spectrum, the line-integrated magnetic field on the order of 30–50 mT is determined. The agreement between the measured values and the vacuum field (neglecting the impact of the plasma) calculations on the axis of the PSI-2 is found to be about 15–20%.

Monitoring the Fractional Distillation Purification of Inorganic Hydrides by Diode Laser Absorption Spectroscopy

2020 ◽  
Vol 56 (12) ◽  
pp. 1284-1289
Author(s):  
Ya. Ya. Ponurovskii ◽  
D. B. Stavrovskii ◽  
Yu. P. Shapovalov ◽  
M. V. Spiridonov ◽  
A. S. Kuz’michev ◽  
...  
Keyword(s):  
Diode Laser ◽  
Absorption Spectroscopy ◽  
Fractional Distillation ◽  
Laser Absorption Spectroscopy ◽  
Laser Absorption ◽  
Diode Laser Absorption

CF3,CF2and CF Radical Measurements in RFCHF3Etching Plasma Using Infrared Diode Laser Absorption Spectroscopy

1994 ◽  
Vol 33 (Part 1, No. 7B) ◽  
pp. 4298-4302 ◽  
Author(s):  
Koji Maruyama ◽  
Katsunori Ohkouchi ◽  
Yasunori Ohtsu ◽  
Toshio Goto
Keyword(s):  
Diode Laser ◽  
Absorption Spectroscopy ◽  
Laser Absorption Spectroscopy ◽  
Laser Absorption ◽  
Diode Laser Absorption

Diode-laser absorption measurements of CO 2 , H 2 O, N 2 O, and NH 3 near 2.0 μm

1998 ◽  
Vol 67 (3) ◽  
pp. 283-288 ◽  
Author(s):  
R.M. Mihalcea ◽  
M.E. Webber ◽  
D.S. Baer ◽  
R.K. Hanson ◽  
G.S. Feller ◽  
...  
Keyword(s):  
Diode Laser ◽  
Laser Absorption ◽  
Diode Laser Absorption ◽  
Absorption Measurements
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