Ultraviolet Absorption of Refractory Elements by a Dual Laser Plasma Method

AbstractThe dual laser-produced plasma technique for the study of ionic absorption spectra has been developed by the use of two Q-switched ruby lasers to enable independent generation of the absorbing and back-lighting plasmas. Optical pulse handling is used in the coupling cicuits to enable reproducible pulse delays from 250 nsec. to 10 msec, to be achieved. At delay times > 700 nsec. spectra of essentially pure neutral species are observed. The technique is valuable, not only for obtaining the neutral spectra of highly refractory and/or corrosive materials but also for studying behaviour of ionic species as a function of time. Typical spectra are shown in Fig. 1.

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ULTRAVIOLET ABSORPTION OF REFRACTORY ELEMENTS BY A DUAL LASER PLASMA METHOD

Le Journal de Physique Colloques ◽

10.1051/jphyscol:1988151 ◽

1988 ◽

Vol 49 (C1) ◽

pp. C1-243-C1-246 ◽

Cited By ~ 5

Author(s):

J. T. COSTELLO ◽

W. G. LYNAM ◽

P. K. CARROLL

Keyword(s):

Laser Plasma ◽

Ultraviolet Absorption ◽

Plasma Method ◽

Refractory Elements ◽

Dual Laser

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Absorption spectroscopy of an expanding laser produced lithium plasma in the extreme ultraviolet using the Dual Laser Plasma technique

Applied Surface Science ◽

10.1016/s0169-4332(97)00726-5 ◽

1998 ◽

Vol 127-129 ◽

pp. 686-691 ◽

Cited By ~ 12

Author(s):

William Whitty ◽

John Costello ◽

Eugene Kennedy ◽

Christopher Moloney ◽

Jean-Paul Mosnier

Keyword(s):

Absorption Spectroscopy ◽

Laser Plasma ◽

Extreme Ultraviolet ◽

Plasma Technique ◽

Lithium Plasma ◽

Dual Laser

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VUV photoabsorption spectra of Pb and Bi ions using dual laser plasma technique

Journal of Physics Conference Series ◽

10.1088/1742-6596/1289/1/012035 ◽

2019 ◽

Vol 1289 ◽

pp. 012035

Author(s):

H Lu ◽

P Hayden ◽

P Nicolosi ◽

J Costello

Keyword(s):

Laser Plasma ◽

Plasma Technique ◽

Dual Laser

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Mass Spectrometric Detection of Ionic and Neutral Species During Highly Preheated Air Combustion by Alkali Element Ion Attachment

Journal of Engineering for Gas Turbines and Power ◽

10.1115/1.1473158 ◽

2002 ◽

Vol 124 (4) ◽

pp. 749-756 ◽

Cited By ~ 4

Author(s):

T. Ishiguro ◽

A. Matsunami ◽

K. Matsumoto ◽

K. Kitagawa ◽

N. Arai ◽

...

Keyword(s):

Oxygen Concentration ◽

Chemical Species ◽

Ionic Species ◽

Combustion Mechanism ◽

Low Oxygen ◽

Neutral Species ◽

Alkali Element ◽

Compact Size ◽

Ion Attachment ◽

Low Oxygen Concentration

The use of high temperature and low oxygen concentration air as the oxidizer for regenerative combustion has become of increasing interest because this technology results in higher thermal efficiency, low energy consumption, and reduced emission of pollutants, such as NOx and CO2, and compact size of the equipment. In this study information is provided on the effect of preheating the low oxygen concentration air on the formation and detection of chemical ions and neutral species formed in flames. These ions and species were detected directly using mass spectrometry. Such information also assists in determining the combustion mechanism. The intact ionic species have been detected only at downstream position of the flames. By applying an alkali element Li+ ion attachment technique, neutral species, such as Li+-attached ions have been also detected successfully. Three specific flame cases have been examined. They include using normal air (flame I), preheated air (flame II), and preheated air with low (diluted) oxygen concentration in air (flame III). The results show significant change in the spectra of the intact ionic species and the Li+-adduct neutral species amongst the three flames. The results also show that preheating the combustion air increases the number of chemical species formed in the flames. However, these chemical species decrease with low oxygen concentration (diluted) combustion air.

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