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  • 1
    Electronic Resource
    Electronic Resource
    Vibrational spectroscopy and intramolecular energy transfer in isocyanic acid (HNCO) (1999)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 110 (1999), S. 10850-10862 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: Room temperature photoacoustic spectra in the region of the first through the fourth overtones (2ν1 to 5ν1) and free-jet action spectra of the second through the fourth overtones (3ν1 to 5ν1) of the N–H stretching vibration permit analysis of the vibrational and rotational structure of HNCO. The analysis identifies the strong intramolecular couplings that control the early stages of intramolecular vibrational energy redistribution (IVR) and gives the interaction matrix elements between the zero-order N–H stretching states and the other zero-order states with which they interact. The experimentally determined couplings and zero-order state separations are consistent with ab initio calculations of East, Johnson, and Allen [J. Chem. Phys. 98, 1299 (1993)], and comparison with the calculation identifies the coupled states and likely interactions. The states most strongly coupled to the pure N–H stretching zero-order states are ones with a quantum of N–H stretching excitation (ν1) replaced by different combinations of N–C–O asymmetric or symmetric stretching excitation (ν2 or ν3) and trans-bending excitation (ν4). The two strongest couplings of the nν1 state are to the states (n−1)ν1+ν2+ν4 and (n−1)ν1+ν3+2ν4, and sequential couplings through a series of low order resonances potentially play a role. The analysis shows that if the pure N–H stretch zero-order state were excited, energy would initially flow out of that mode into the strongly coupled mode in 100 fs to 700 fs, depending on the level of initial excitation. © 1999 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.479026
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  • 2
    Electronic Resource
    Electronic Resource
    Experimental and theoretical vibrational overtone spectra of vCH=3, 4, 5, and 6 in formaldehyde (H2CO) (1996)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 104 (1996), S. 3472-3478 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: We present the first photoacoustic absorption spectra of higher C–H stretching overtones in formaldehyde up to the visible spectral region. The analysis of the coarse rotational structure on the basis of asymmetric rotor simulations provides band centers up to the fifth overtone (vCH=6). A two dimensional normal coordinate model for the C–H stretching degrees of freedom explains the observed polyad structure of the spectrum using ab initio (MP2/6-311G**) potential energy and electric dipole functions. The observed intensity distribution reflects the increasing local mode character of higher overtone wave functions within the normal coordinate subspace. © 1996 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.471537
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  • 3
    Electronic Resource
    Electronic Resource
    Systemic Fungicides and the Control of Oomycetes (1986)
    Palo Alto, Calif. : Annual Reviews
    Annual Review of Phytopathology 24 (1986), S. 311-338 
    Details
    ISSN: 0066-4286
    Source: Annual Reviews Electronic Back Volume Collection 1932-2001ff
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition , Biology
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1146/annurev.py.24.090186.001523
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  • 4
    Electronic Resource
    Electronic Resource
    C4 photosynthesis in Cyperus longus L., a species occurring in temperate climates (1981)
    Oxford, UK : Blackwell Publishing Ltd
    Plant, cell & environment 4 (1981), S. 0 
    Details
    ISSN: 1365-3040
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Biology
    Notes: Abstract. Cyperus longus L., which has a widespread but disjunct distribution throughout Europe and extends northwards into Britain, was found to be a C4 species based upon its Kranz leaf anatomy, low CO2 compensation point and the labelling of malate as an early product of 14CO2 fixation. The photosynthetic characteristics of C. longus are similar to many other C4 species with a high maximum rate of photosynthesis (〉 1.5 mg CO2 m −2 s −1) and a relatively high temperature optimum (30–35°C), but unlike many C4 species the rate of photosynthesis does not decline rapidly below the optimum temperature and a substantial rate (0.6 mgCO2 m−2s−1)occursat 15°C. Leaf extension is very slow at 15°C and shows a curvilinear response to temperatures between 15 and 25°C. Leaves extend at a rate of almost 4 cm d−1 at 25°C.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1365-3040.1981.tb01038.x
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  • 5
    Electronic Resource
    Electronic Resource
    Organochlorine Chemicals in Tree Swallows Nesting in Pool 15 of the Upper Mississippi River (2000)
    Springer
    Bulletin of environmental contamination and toxicology 64 (2000), S. 341-346 
    Details
    ISSN: 1432-0800
    Source: Springer Online Journal Archives 1860-2000
    Topics: Energy, Environment Protection, Nuclear Power Engineering , Medicine
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s001280000005
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  • 6
    Electronic Resource
    Electronic Resource
    Column Observations of Stratospheric Gases at Søndre Strømfjord, Greenland During Winter 1994-1995 (1998)
    Springer
    Journal of atmospheric chemistry 30 (1998), S. 103-118 
    Details
    ISSN: 1573-0662
    Keywords: stratospheric gases ; ozone chemistry ; FTS ; SESAME
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Geosciences
    Notes: Abstract As part of the Second European Stratospheric Arctic and Mid-latitude Experiment (SESAME) field campaign, observations were made during the period from October 1994 to April 1995 at Søndre Strømfjord, Greenland (67°N, 53°W). Using a Fourier transform spectrometer, high resolution (0.06 cm-1) infrared spectra were recorded with the sun as a radiation source. Column amounts of trace gases including HCl, HF, HNO3, N2O and O3 are shown for five time periods during the course of the 1994-95 Arctic winter. Results are compared with lower stratospheric potential vorticity fields to describe variations in trace gas column amounts.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1006051008842
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  • 7
    Electronic Resource
    Electronic Resource
    Effect of phase fluctuations upon penetration depth (1995)
    Springer
    Journal of superconductivity 8 (1995), S. 629-630 
    Details
    ISSN: 1572-9605
    Keywords: phase fluctuation ; penetration depth ; correlation function
    Source: Springer Online Journal Archives 1860-2000
    Topics: Electrical Engineering, Measurement and Control Technology , Physics
    Notes: Abstract The temperature dependence of the static penetration λ(T) has been used as a guide to the nature of the superconducting state in high-T c materials. It has been argued that an algebraic temperature dependence in the ratio Δλ(T)/λ(0) ≡ [λ(T) — λ(0)]/λ(0) at low temperature is evidence for d-wave pairing. This paper examines the effect of superconducting phase fluctuations upon λ(T) and finds an algebraic dependence over a broad range of temperature.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00727450
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  • 8
    Electronic Resource
    Electronic Resource
    Intercomparison of remote measurements of stratospheric NO and NO2 (1990)
    Springer
    Journal of atmospheric chemistry 10 (1990), S. 111-144 
    Details
    ISSN: 1573-0662
    Keywords: NO ; NO2 ; intercomparison ; remote ; balloon ; stratosphere
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Geosciences
    Notes: Abstract During the 1982 and 1983 Balloon Intercomparison Campaigns, the vertical profile of stratospheric NO2 was measured remotely by nine instruments and that of NO by two. Total overhead columns were measured by two more instruments. Between 30 and 35km, where measurements overlapped, agreement between NO profiles was within ±30%, which is better than the accuracies claimed by the experimenters. Between 35 and 40km there was similarly good agreement between NO2 profiles, but below 30km, differences of greater than a factor three were found. In the second Campaign, NO2 values from most instruments agreed within their quoted errors, except that the Oxford radiometer gave much lower values; but the first Campaign and the column measurements show a more uniform spread of results. These differences below 30km could not be resolved, but new laboratory measurements are planned which should do so.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00054853
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  • 9
    Electronic Resource
    Electronic Resource
    Intercomparison of measurements of stratospheric hydrogen fluoride (1990)
    Springer
    Journal of atmospheric chemistry 10 (1990), S. 219-236 
    Details
    ISSN: 1573-0662
    Keywords: Hydrogen fluoride ; HF ; stratosphere ; intercomparisons ; infrared
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Geosciences
    Notes: Abstract Observations of the vertical profile of hydrogen fluoride (HF) vapor in the stratosphere and of the vertical column amounts of HF above certain altitudes were made using a variety of spectroscopic instruments in the 1982 and 1983 Balloon Intercomparison Campaigns. Both emission instruments working in the far infrared spectral region and absorption instruments using solar occultation in the 2.5μm region were employed. No systematic differences were seen in results from the two spectral regions. A mean profile from 20–45 km is presented, with uncertainties ranging from 20% to 50%. Total columns measured from ground and from 12 km are consistent with the profile if the mixing ratio for HF is small in the tropophere and low stratosphere.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00054857
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  • 10
    Electronic Resource
    Electronic Resource
    Balloon Intercomparison Campaigns: Results of remote sensing measurements of HCl (1990)
    Springer
    Journal of atmospheric chemistry 10 (1990), S. 237-272 
    Details
    ISSN: 1573-0662
    Keywords: stratospheric composition ; HCl ; remote sensing ; atmospheric spectroscopy
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Geosciences
    Notes: Abstract All of the techniques used to measure stratospheric HCl during the two BIC campaigns involved high resolution infrared spectroscopy. The balloon-borne instruments included five different spectrometers, three operating in the solar absorption mode and two in emission (at distinctly different wavelengths). Ground-based and aircraft correlative measurements were made close to the balloon locations, again by near-infrared spectroscopy. Within this set of results, comparisons between different techniques (absorption vs emission) viewing the same airmass (i.e., on the same gondola) were possible, as were comparisons between the same technique used on different gondolas spaced closely in time and location. The final results yield a mean profile of concentration of HC1 between 18 and 40 km altitude; an envelope of ±15% centered on this profile encompasses all of the results within one standard deviation of their individual mean values. The absolute accuracy of the final profile is estimated to be no worse than 10%. It is concluded also that the measurement techniques for HCl have reached a level of performance where a precision of 10% to 15% can be confidently expected.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00054858
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