Temperature estimation using Boltzmann plot method of many calcium emission lines in laser plasma produced on river clamshell sample

AbstractWe have studied the confinement of laser plasma by shock waves (also known as “spatial confinement” induced on an ore sample, as exemplified by changes in the intensity of Ag I 328.07 nm and Au I 267.60 nm emission lines. It is established that the maximum increase in intensity of these lines is observed at 2- to 2.5-μs delay, which corresponds to an increase in the plasma temperature up to 5900 K. The signal-to-noise ratio upon the spatial confinement of plasma is somewhat reduced, but the overall growth of signal intensity provides increase in the sensitivity of laser-induced breakdown spectrometry for determining trace elements in ores.

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Long-term Cyclic Variations of Prominences, Green and Red Coronae over Solar Cycles

International Astronomical Union Colloquium ◽

10.1017/s0252921100064496 ◽

2000 ◽

Vol 179 ◽

pp. 201-204

Author(s):

Vojtech Rušin ◽

Milan Minarovjech ◽

Milan Rybanský

Keyword(s):

Emission Lines ◽

High Latitudes ◽

Green Line ◽

Solar Cycles ◽

The South ◽

Coronal Emission ◽

Local Maxima ◽

The North ◽

Cyclic Variations

AbstractLong-term cyclic variations in the distribution of prominences and intensities of green (530.3 nm) and red (637.4 nm) coronal emission lines over solar cycles 18–23 are presented. Polar prominence branches will reach the poles at different epochs in cycle 23: the north branch at the beginning in 2002 and the south branch a year later (2003), respectively. The local maxima of intensities in the green line show both poleward- and equatorward-migrating branches. The poleward branches will reach the poles around cycle maxima like prominences, while the equatorward branches show a duration of 18 years and will end in cycle minima (2007). The red corona shows mostly equatorward branches. The possibility that these branches begin to develop at high latitudes in the preceding cycles cannot be excluded.

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Ultraviolet Absorption of Refractory Elements by a Dual Laser Plasma Method

International Astronomical Union Colloquium ◽

10.1017/s0252921100107821 ◽

1988 ◽

Vol 102 ◽

pp. 243-246

Author(s):

J.T. Costello ◽

W.G. Lynam ◽

P.K. Carroll

Keyword(s):

Absorption Spectra ◽

Laser Plasma ◽

Optical Pulse ◽

Ionic Species ◽

Neutral Species ◽

Plasma Method ◽

Plasma Technique ◽

Refractory Elements ◽

Delay Times ◽

Dual Laser

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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INVESTIGATION OF PLASMA FORMATION DYNAMICS AND PROPERTIES OF UNDEREXPANDED SUPERSONIC EROSIVE LASER PLASMA FLARES

Le Journal de Physique Colloques ◽

10.1051/jphyscol:19797368 ◽

1979 ◽

Vol 40 (C7) ◽

pp. C7-761-C7-762

Author(s):

G. I. Bakanovich ◽

L. Ya. Min'ko ◽

A. N. Chumakov

Keyword(s):

Laser Plasma ◽

Plasma Formation ◽

Formation Dynamics ◽

Erosive Laser Plasma

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