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  • 1
    Electronic Resource
    Electronic Resource
    Possibility of 24MgH+ in the solar atmosphere-high resolution rotation-vibration spectra (1976)
    Springer
    Solar physics 49 (1976), S. 217-230 
    Details
    ISSN: 1573-093X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract High resolution rotation-vibration spectra of Δv = 1 and 2 sequences of 24MgH+ are obtained by a differencing process invoking the known structures of electronic bands observed in the region 214–340 nm. A reversal of R branch (band head formation) is noticed in each of the rotation-vibration bands. The J = 1 → J = 0 transition is predicted to be at 376098, 365301, 354286 and 342981 MHz for v = 0,1,2 and 3, respectively, in the ground electronic state 1∑+. The equilibrium rotational constants B e, α e and r e for the X 1•E+ state are found 6.4637cm−1, 0.1899 cm−1 1.6421 Å, respectively.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00162446
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  • 2
    Electronic Resource
    Electronic Resource
    Biology and Biological Action of the Defensive Secretion from a Jamaican Millipede (1997)
    Springer
    Naturwissenschaften 84 (1997), S. 143-144 
    Details
    ISSN: 1432-1904
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Chemistry and Pharmacology , Natural Sciences in General
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s001140050364
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  • 3
    Electronic Resource
    Electronic Resource
    On the possibility of the existence of NO+ in interstellar space (1980)
    Springer
    Astrophysics and space science 68 (1980), S. 87-97 
    Details
    ISSN: 1572-946X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract Frequencies are computed for transitions in the NO+ ion which are expected to occur in the millimeter and infrared regions usually covered by millimeter-wave and infrared astronomy. The emission cross-sections and spontaneous emission rates of the microwave transitions of NO+ ion are presented. The NO+ molecule is likely to be detectable in low-temperature sources whose state temperatures are not greater than 15 K. Transition probabilities and oscillator strengths for the Δv=1, 2, 3 and 4 vibration-rotation bands are derived from published theoretical dipole moment functions, obtained by an accurate multi-configuration self-consistent field procedure, in the1∑ ground state of NO+ ion. On the basis of binary gas phase reactions, the formation and destruction of NO+ in interstellar space are also discussed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00641645
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  • 4
    Electronic Resource
    Electronic Resource
    Predictions on finding the SiH+ and SiH in interstellar space (1978)
    Springer
    Astrophysics and space science 56 (1978), S. 415-419 
    Details
    ISSN: 1572-946X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract Frequencies are computed for transitions in the SiH+ and SiH molecules which are expected to occur in the millimeter region usually covered by radiowave astronomy. These molecules are expected to be in low-temperature sources whose state temperatures are not greater than about 20 K. On the basis of binary gas-phase reactions, the formation and destruction of the SiH+ and the SiH radicals are also discussed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01879572
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  • 5
    Electronic Resource
    Electronic Resource
    The 3410 Å band of the PH molecule in the solar photospheric spectrum (1984)
    Springer
    Solar physics 90 (1984), S. 259-268 
    Details
    ISSN: 1573-093X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract Some weak unidentified solar photospheric lines in the wavelength range: (3400–3465) Å may be due to PH lines of the (0, 0) band of the PH(A 3 Π i - X 3 ∑-)system. These faint PH molecular lines have resulted an excitation temperature of the order of 4500 K. Using experimental lifetime data for PH in the A 3 Π i state, an absorption oscillator strength f 00 = 0.0075 is derived for the 3410 Å band of the PH (A 3 Π i - X 3 ∑-)system. Accurate line positions, oscillator strength and transition probability for the 4.4μ fundamental rotation-vibration band of the PH molecule are obtained. A comparison of positions of some lines of the 4.4μ band with those obtained on new tracings of high resolution solar spectra shows many coincidences with weak solar lines.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00173954
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  • 6
    Electronic Resource
    Electronic Resource
    On the possibility of faint molecular lines of PO, PH, MgH+, and CN in the solar spectrum (1988)
    Springer
    Solar physics 115 (1988), S. 221-227 
    Details
    ISSN: 1573-093X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract Equivalent width calculations for some electronic and vibration-rotation transitions of the molecules PO, PH, MgH+f, and CN have been carried out for a few umbral, photospheric, and facular model atmospheres. It appears that a few weak lines of these molecules might show up in the umbral spectrum. Le Blanc bands of CN are too weak for detection in the solar spectrum.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00148724
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  • 7
    Electronic Resource
    Electronic Resource
    Haser model CN, C2 and C3 production rates in some comets (1989)
    Springer
    Earth, moon and planets 47 (1989), S. 15-31 
    Details
    ISSN: 1573-0794
    Source: Springer Online Journal Archives 1860-2000
    Topics: Geosciences , Physics
    Notes: Abstract Emission fluxes of CN, C2 and C3 species observed in the coma of some comets are analysed in the framework of Haser model. CN, C2 and C3 production rates are determined using recently derived fluorescence efficiencies and dependence of CN, C2 and C3 production rates on the heliocentric distance is studied. Evidence for a burst type activity around January 15, 1974 in the post-perihelion period of comet Kohoutek (1973f) is observed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00056328
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  • 8
    Electronic Resource
    Electronic Resource
    An analysis of spectrophotometric observations of comets Austin (1982g) and Bradfield (1980t) (1989)
    Springer
    Earth, moon and planets 47 (1989), S. 231-239 
    Details
    ISSN: 1573-0794
    Source: Springer Online Journal Archives 1860-2000
    Topics: Geosciences , Physics
    Notes: Abstract Post-perihelion observed emission fluxes at 388 nm (CN) and 516 nm (C2) of the coma of comets Austin (1982g) and Bradfield (1980t) are analysed in the framework of the Haser model. Ratios of Haser model CN and C2 parent production rates with expansion velocity show that each comet behaves normally. For comet Austin (1982g), the Q CN/v and Q c2/v values decrease with increase of heliocentric distance of comet. For an assumed %; activity of the total spherical surface area of the nucleus, the water vaporization theory coupled with derived water production rates from the International Ultraviolet Explorer H and OH flux data yields a nuclear diameter of about 6 km for comet Austin (1982g). For comet Bradfield (1980t), the derived nuclear diameter is expected to be of about 1 km. In each comet, the dust mass production rates as well as ratio of dust-to-gas mass production rates decrease with increase of heliocentric distance of comet.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00114102
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  • 9
    Electronic Resource
    Electronic Resource
    24MgH+ in the solar photospheric spectrum (1984)
    Springer
    Astrophysics and space science 102 (1984), S. 287-293 
    Details
    ISSN: 1572-946X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract The24MgH+ (A 1Σ+ −X 1Σ+) molecular lines have been identified in the photospheric spectrum. The rotational excitation temperature determined from the analysis of molecular line intensities of24MgH+ is found to be of the order of 4850 K which corresponds to the photospheric temperature of the Sun. The CNDO/2 dipole moments of24MgH+ for internuclear distance range: (1.3–2.1) Å in theX 1Σ+ state can be approximated byM(R)=4.92+1.33R. Estimations for the spontaneous emission Einstein coefficients (A v′ v″ ) and the absorption oscillator strengths (f v′ v″ ) for the (1, 0), (2, 0), and (2, 1) transitions in theX 1Σ+ state of the24MgH+ ion are also made.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00650177
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  • 10
    Electronic Resource
    Electronic Resource
    Photodissociation lifetime of 32S2 molecule in comets (1986)
    Springer
    Earth, moon and planets 36 (1986), S. 117-125 
    Details
    ISSN: 1573-0794
    Source: Springer Online Journal Archives 1860-2000
    Topics: Geosciences , Physics
    Notes: Abstract Photodissociation lifetime of 32s2in comets is calculated by absorption of solar photons into the B3Σ− state and velocity distributions of sulphur atoms are determined. Absorption of solar photons of wavelength ~ 280 nm leads to a photodissociation lifetime of about 250 s for 32S2 molecule in comets when sun-comet distance is 1 AU. Forbidden lines corresponding to 1D-3P transitions of neutral sulphur atom may be detectable at about 11 306 and 10 821 Å in comets. The production rate of 32S2 dimer in comet IRAS-Araki-Alcock 1983d compares well with the production rate of CS, observed in comet Bradfield, when compared at the same heliocentric distance. The chemistry of 32S2 dimer formation in the inner coma of a comet is discussed in the framework of some gas phase reactions.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00057603
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