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  • 33  (9)
  • 79.20.Ds  (3)
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  • 1
    Electronic Resource
    Electronic Resource
    Laser photoion projector (1984)
    Springer
    Applied physics 33 (1984), S. 57-61 
    Details
    ISSN: 1432-0649
    Keywords: 33 ; 42.60 ; 82.50
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract A laser photodesorption microscope has been applied to obtain 4×103-fold images of rhodamine crystals on a tip with a diameter of 66μm. Peculiarities of the formation of these images have been studied with different values of electric field strength on the tip and laser pulse intensities.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00690026
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  • 2
    Electronic Resource
    Electronic Resource
    Laser-stimulated field desorption of molecular ions from a tungsten emitter (1988)
    Springer
    Applied physics 45 (1988), S. 53-57 
    Details
    ISSN: 1432-0649
    Keywords: 33 ; 79.20.Ds ; 79.70.+q
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract We report here on a experimental observation of photon-stimulated field emission of molecular anthracene ions from the surface of a layer adsorbed on a tungsten field-emitter tip. When the tip is irradiated with laser pulses 249, 308, and 400 nm in wavelength falling within the absorption bands of anthracene, the stimulated ion signal is proportional to the pulse fluence. The efficiency of the process decreases with the increasing laser wavelength. Photon stimulation is believed to be due to the resonance excitation of the anthracene molecules, followed by the field ionization of the excited molecules.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00692342
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  • 3
    Electronic Resource
    Electronic Resource
    Highly selective and efficient multiphoton dissociation of polyatomic molecules in multiple-frequency IR-laser fields (1985)
    Springer
    Applied physics 36 (1985), S. 93-103 
    Details
    ISSN: 1432-0649
    Keywords: 82.50 ; 33
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract An ir multiphoton dissociation (MPD) process in multiple-frequency ir-laser fields has been experimentally realized. A selectivity ofS=104 was obtained in separating13C/12C isotopes upon multiple-frequency ir multiphoton dissociation (MFMPD) of the CF2HCl molecule, the dissociation yield13β for the13CF2HCl molecule amounting to around 1%. A yield of13β was reached at a selectivity ofS=102, and the total laser fluence required for the process was reduced. A new mechanism—“sticking” of molecules on the lower discrete vibrational levels—responsible for the low MPD yields observed for some molecules is discussed and a technique to eliminate it and thus maximize the dissociation yields is proposed. Ways to improve the selectivity by MFMPD are analyzed and a simple method for obtaining from a single TEA CO2 laser a multiple-frequency radiation suitable for experimental realization of MFMPD is suggested.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00694695
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  • 4
    Electronic Resource
    Electronic Resource
    Time-resolved laser optoacoustic tomography of inhomogeneous media (1996)
    Springer
    Applied physics 63 (1996), S. 545-563 
    Details
    ISSN: 1432-0649
    Keywords: 79.20.Ds ; 87.71.Rh ; 87.73.Ca
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract The methods of time-resolved laser optoacoustic tomography of inhomogeneous media and related problems are reviewed. Time-resolved laser optoacoustic tomography allows one to measure the distribution of light absorption in turbid media with depth resolution up to several microns in real time. The theory of laser excitation of acoustic waves by absorbing of light in particles, dispersed in transparent, light-absorbing or scattering media, is developed. The distribution of light absorption can be obtained from the temporal course of acoustic pressure. Two schemes of acoustic wave detection — in the medium under testing (direct detection) and in transparent medium, coupled to the investigated one (indirect detection) — are discussed. In both cases the reconstruction of light absorption can be made by simple calculations. Test experiments with homogeneous and layered media confirm the proposed theoretical models and the possibility of using the proposed experimental schemes. Light absorption in homogeneous, inhomogeneous media and in absorbing particles dispersed in turbid media was investigated. The experimental setup allows one to measure the absorption coefficients over the range 1-500 cm−1 with the depth resolution 10–15 μm over the depth 1–1.5 mm.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01830994
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  • 5
    Electronic Resource
    Electronic Resource
    Laser ablation of aqueous solutions with spatially homogeneous and heterogeneous absorption (1994)
    Springer
    Applied physics 59 (1994), S. 73-81 
    Details
    ISSN: 1432-0649
    Keywords: 79.20.Ds ; 83.70.Hq ; 83.70.Gp
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract The ablation efficiency of aqueous solutions with different concentrations and spatially homogeneous (CuCl2 solution) and heterogeneous (ink solution) absorption was studied as a function of the pulse-energy fluence (Nd:YAG laser, λ=1064 nm, τp = 20 ns). The latter was varied over a wide range from 0.15 J/cm2 to 8.00 J/cm2. The ablation threshold of solutions with heterogeneous absorption was found to be much lower (3 to 4 times) than the ablation threshold of solutions with homogeneous absorption and with the same average absorption coefficient. The ablation efficiency of heterogeneous solutions was higher by more than an order of magnitude. It was found that the ablation efficiency increases drastically for both types of solutions as the pulse energy fluence was raised to exceed the ablation threshold by 2 or 3 times. At such energy fluences, along with small droplets, larger droplets (1.5–2 mm cross section) could be ejected. This points to the ablation of solutions being affected by a hydrodynamic shock formed as a result of the pulsed recoil pressure excerted by the ablation products. The differences between the ablation processes for solutions with homogeneous and heterogeneous absorption as well as the hydrodynamic destruction at high energy fluences are discussed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01081730
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  • 6
    Electronic Resource
    Electronic Resource
    The application of a high pulse repetition rate CO2 laser with high average power for isotope separation by molecular dissociation in a strong IR field (1977)
    Springer
    Applied physics 14 (1977), S. 217-220 
    Details
    ISSN: 1432-0630
    Keywords: 82.50 ; 33
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Notes: Abstract Considering a SF6 molecule we demonstrate feasibility of using high pulse repetition rate CO2 laser for isotope separation by selective molecular dissociation in a strong IR field. Dependences of dissociation efficiency as well as separation selectivity on pulse repetition rate up to 150 Hz are investigated. The inherent thermal effects are discussed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00883092
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  • 7
    Electronic Resource
    Electronic Resource
    Photoionization mass-spectrometry of benzene and benzaldehyde molecules with an excimer KrF laser (1980)
    Springer
    Applied physics 22 (1980), S. 293-297 
    Details
    ISSN: 1432-0630
    Keywords: 33 ; 82 ; 50
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Notes: Abstract A laser photoionization time-of-flight mass-spectrometer has been developed and used to investigate the photoionization and photofragmentation of benzene and benzaldehyde molecules by an excimer KrF laser radiation at the wavelength of 249 nm in the intensity range from 5·104 to 5·109 W/cm2. It has been found that at low laser intensity ions formed by two-step photoionization are most abundant in mass spectra. By increasing laser intensity an extensive fragmentation of molecules, up to C+ ions, was observed. The maximum ionization yield of benzaldehyde comes to 0.1% of the number of molecules in the photoionization volume and, according to calculations, to 10% for benzene molecules, when the radiation intensity is 5·109 W/cm2.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00899880
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  • 8
    Electronic Resource
    Electronic Resource
    Narrow resonances (Δv=2·10−2 cm−1) of multiple-photon IR absorption in ethylene (1980)
    Springer
    Applied physics 22 (1980), S. 429-432 
    Details
    ISSN: 1432-0630
    Keywords: 82.50 ; 33
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Notes: Abstract Narrow peaks of multiple-photon absorption in thev 7 band of ethylene with the spectral width 0.02 cm−1 and the contrast factor of up to 102 have been observed at the intensity of laser radiation 0.04 and 0.6 MW/cm2. The multiple-photon spectra of ethylene in intense IR field have been studied with the use of a quasi-single-mode continuously tunable CO2 laser. The results of the experiments are interpreted within the model of spepwise molecular excitation due to weak transitions.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00901069
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  • 9
    Electronic Resource
    Electronic Resource
    Laser multiphoton and multistep photoionization of molecules and mass spectrometry (1981)
    Springer
    Applied physics 24 (1981), S. 89-106 
    Details
    ISSN: 1432-0630
    Keywords: 33 ; 42.65 ; 82.50
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Notes: Abstract A review of laser-induced photoionization of polyatomic molecules and the application of this process in mass-spectrometry is presented. Combination of laser selective photoionization and mass spectral analysis of fragments as a promising tool for the detection of trace amounts of complex molecules is considered particularly.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00902263
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  • 10
    Electronic Resource
    Electronic Resource
    Nonthermal desorption of molecular ions of polyatomic molecules induced by uv laser radiation (1981)
    Springer
    Applied physics 25 (1981), S. 71-76 
    Details
    ISSN: 1432-0630
    Keywords: 33 ; 79 ; 82.65
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Notes: Abstract The paper presents the results of studies into ion desorption from the surface of adenine and anthracene molecular crystals and anthracene molecules adsorbed on a metal as the surface is irradiated by an uv laser at λ=249, 308, and 337 nm. A sharp increase in molecular ion yield has been revealed with a decrease in radiation wavelength down to 249 nm. At this wavelength the effect of molecular ion desorption is observed at the radiation intensity of 20∶50 kW/cm2 and pulse duration of 20 ns, it cannot be explained by thermal mechanisms. The initial velocity distribution of photoions is nonthermal by character, with maximum velocity of 2·105 cm/s in case of adenine. The mechanisms responsible for the effect observed are discussed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00935394
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