n 
IS 
X 
500-channel camera which operated in spectral 
region from 180 to 950 nm. To reduce 
experimental errors caused by fluctuations of 
the energy and spatial distribution of the laser 
beam spectra were averaged over 30-100 
laser pulses. 
Next data was fed to an IBM PC/AT computer. 
Subsequent processing of spectra was carried 
out by the computer. The wavelength scale of 
the spectra was calibrated against spectra of 
standard solutions, consisting of elements with 
well-known and reliably identified spectral 
lines and against neon lamp lines. 
3. RESULTS AND DISCUSSION 
As a result we found the drastic increase of 
contrast of spectral lines of iron dissolved in 
water in the integral emission spectra from 
plasma produced by light from eximer KrF laser 
in comparison with the excitation of plasma 
plums by YAG:Nd laser beam. We attributed 
this effect to the resonant transition of Fe 
(248.3 nm). 
We also found sufficient increasing of signal /noise 
ratio in experiments on resonant initiation plasma 
plums by YAG:Nd laser at the surfaces of clear 
Cu and Cu salt water solution. |t was shown 
that in the case when we initiate plasma by 
wavelength 532 nm (second harmonic of 
YAG:Nd laser) which is close to resonant Cu 
transition the signal/noise ratio of Cu lines was in 
7-8 times grater than in the case of initiation 
plasma by unresonant wavelength 1064 nm (first 
harmonic of Nd:YAG laser). 
These results show that the resonance excitation 
of plasma by tunable lasers is one of the most 
promising way for the increasing sensitivity of the 
remote spectrochemical analysis. 
Author want especially to mention great 
contribution in this work of the Dr. M.A.Davydov. 
4. REFERENCES 
E.B.Belyaev, Yu.D.Kopytin, S.T.Penin, 
S.A.Shishigin, 1994. Rapid Laser Analysis of 
Beryllium Containing Aerosols, Russian 
Journal "Optica Atmosphery", Vol.7, No.5, 
pp.669-672. 
A.F.Bunkin, A.V.Rezov, D.Yu.Tsipenyuk, 
1994. Method and technique for remote 
sensing of sea and land surfaces element 
analysis. In Proceedings of the Second Thematic 
Conference Remote Sensing for Marine and 
Coastal Environments, New Orleans, 
Louisiana, USA, Vol.ll, pp.61-69. 
715 
C.Parriger and JW.L. Lewis, 1993. 
Measurements of Sodium Chloride 
Concentration in Water Droplets Using Laser- 
Induced Plasma Spectroscopy, Applied 
Physics Communications, 12(1), pp. 163- 
173. 
D.Yu. Tsipenyuk, D.V. 
Prokhorov, P.l. Ivashkin, 1993. Potentialities of 
Element Analysis of Aqueous Solutions by 
Emission Spectra from Laser Breakdown in the 
Surface, Laser Optics, Vol.3, No.4, pp.910- 
917. 
Viasov, A.M. 
International Archives of Photogrammetry and Remote Sensing. Vol. XXXI, Part B7. Vienna 1996