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  • 1
    Electronic Resource
    Electronic Resource
    Interdiffusion and Composition Polydispersity in Diblock Copolymers above the Ordering Transition (1995)
    s.l. : American Chemical Society
    Macromolecules 28 (1995), S. 2439-2449 
    Details
    ISSN: 1520-5835
    Source: ACS Legacy Archives
    Topics: Chemistry and Pharmacology , Physics
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1021/ma00111a043
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  • 2
    Electronic Resource
    Electronic Resource
    Structure Relaxation and Metastable States at the Microphase Separation Transition in Diblock Copolymers: Experiments with Time-Resolved Small-Angle X-ray Scattering (1994)
    s.l. : American Chemical Society
    Macromolecules 27 (1994), S. 3560-3565 
    Details
    ISSN: 1520-5835
    Source: ACS Legacy Archives
    Topics: Chemistry and Pharmacology , Physics
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1021/ma00091a017
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  • 3
    Electronic Resource
    Electronic Resource
    High-resolution infrared spectroscopy of SF"6 embedded in He clusters
    Amsterdam : Elsevier
    Chemical Physics Letters 229 (1994), S. 1-7 
    Details
    ISSN: 0009-2614
    Source: Elsevier Journal Backfiles on ScienceDirect 1907 - 2002
    Topics: Chemistry and Pharmacology , Physics
    Type of Medium: Electronic Resource
    URL: http://linkinghub.elsevier.com/retrieve/pii/0009-2614(94)01026-9
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  • 4
    Electronic Resource
    Electronic Resource
    Collisional intramolecular energy transfer CN(X 2Σ→A 2Π) in a beam (1994)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 101 (1994), S. 9506-9512 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: The collision-induced intramolecular energy transfer from CN(X 2Σ+,v‘) to CN(A 2Π) was observed in a thermal energy molecular beam through the CN(A→X) emission. In some preliminary experiments, CN(B→X) emission, resulting from collision-induced energy transfer from CN(X 2Σ+) to CN(B 2Σ+), was also observed. CN(X,v‘) radicals were generated in a dc discharge burning in the expansion region of an Ar/CH3CN supersonic beam. Downstream from the source they interacted with a target gas in a collision cell. The relative formation rates of CN(A) with He, Ne, Ar, and Kr as collision gases were obtained. The relative vibrational population distribution of CN(A,v'=2–12) was also determined. It was found to be very similar for the four collision gases. In the wavelength region of the well-known perturbations between the A and X states, the rotational contours of the A→X emission bands show no pronounced enhancement. This demonstrates that in the spin-allowed collision-induced transition CN(A←X) the so-called gateway mechanism is much less important than in some spin-forbidden transitions [N2(B←A') and NO(B←a)] studied previously by us. © 1994 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.467981
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  • 5
    Electronic Resource
    Electronic Resource
    Collision-induced transitions from N2(A' 5Σ+g) to N2(B 3Πg) via the gateway mechanism (1994)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 100 (1994), S. 4848-4861 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: A beam containing N2 in long-lived states was allowed to interact with target particles in a collision cell. Intramolecular transitions A→B and W→B are induced, such as were studied earlier by us by means of the subsequent B→A emission [R. Bachmann, X. Li, Ch. Ottinger, and A. F. Vilesov, J. Chem. Phys. 96, 5151 (1992)]. In the present work the product emission was observed under high resolution (1 A(ring) FWHM). Most of the B→A bands show the typical quasithermal rotational contours. However, in the emissions from the B state vibrational level v=10 sharp superimposed features were observed. They were assigned to transitions from the rotation/fine structure/Λ sublevel 3Πe2(12). This particular level is perturbed by the A' 5Σ+g state, serving as a so-called gateway to allow the otherwise spin-forbidden 5Σ+g→3Πg collision-induced transition. According to this mechanism, the collisions scramble only the levels within the A' state, while the A'→B transition occurs spontaneously through S/O coupling. A similar, less well characterized perturbation was also found for the B,v=12, 3Πe0(16) level. Apart from the gateway mechanism, any direct collisional coupling between the A' and B states appears to be insignificant. This result is contrary to one of the long-standing assumptions on the origin of the Lewis–Rayleigh nitrogen afterglow.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.467205
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  • 6
    Electronic Resource
    Electronic Resource
    Laser spectroscopy of perturbed levels in N2(B 3Πg,v=10) and the first experimental determination of the N2(A' 5Σ+g) term energy (1994)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 100 (1994), S. 4862-4869 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: Using both a pulsed and a narrow-band cw dye laser, laser-induced fluorescence excitation spectra of N2(B,v=10) were observed on the N2(B 3Πg←A 3Σ+u) transition from the metastable N2(A) component of a molecular beam. Lifetime measurements were made for some of the B,v=10 rotational/fine structure levels, including one which was recently shown to exhibit very specific kinetic effects due to a perturbation by the N2(A' 5Σ+g) state [Ch. Ottinger, L. G. Smirnova and A. F. Vilesov, J. Chem. Phys. 100, 4848 (1994)]. The perturbation manifested itself in the present work by a significantly longer lifetime of the 3Πe2(12) level relative to other B,10 levels, as well as by line shifts. The S/O interaction matrix element is obtained to be 0.35 cm−1. From the required very close accidental coincidence between well-identified levels in the B and A' states the term energy of the latter could be precisely determined as Te(A' 5Σ+g)=75 990.0 cm−1. This is the first measurement of this value, and the result is (approximately-equal-to)440 cm−1 lower than was predicted by ab initio calculations.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.467206
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  • 7
    Electronic Resource
    Electronic Resource
    Isotopic study of the intermolecular versus intramolecular energy transfer in the N2(W,A)+N2(X) reactions (1995)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 102 (1995), S. 1673-1680 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: The energy transfer from the long-lived states N2(W 3Δu, A 3Σ+u) to the radiating state N2(B 3Πg) in collisions with N2(X 1Σ+g) was studied under single collision conditions, employing a molecular beam/target gas cell arrangement. By means of using the isotopic species 14N2 in the metastable reactant beam and 15N2 in the target gas cell it was possible to differentiate between the intramolecular and the intermolecular energy transfer mechanisms, on the basis of well-resolved N2(B) product emission spectra. The overall contributions of the two reaction channels were found to be comparable, but they differ greatly in the vibrational product distributions. The intermolecular process populates preferentially the low vibrational levels of 15N2(B,v). The intramolecular process is most efficient for those 14N2(B,v) levels which are in close energy resonance with N2(A or W) vibrational levels. © 1995 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.468899
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  • 8
    Electronic Resource
    Electronic Resource
    Lifetime measurements on perturbed levels of NO(B 2Π) and precise term energy of the NO(a 4Π) state (1994)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 100 (1994), S. 1815-1822 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: Using a pulsed near-UV dye laser, the laser-induced fluorescence (LIF) excitation spectrum of the NO(B 2Π←X 2Π) transition was measured in the (0,9) band on vibrationally hot NO in a molecular beam. Lifetime measurements were made for some of the B,v=0 and v=3 rotational/fine structure levels, including one which was recently shown to exhibit very specific kinetic effects due to a perturbation by the NO(a 4Π) state [Ch. Ottinger and A. F. Vilesov, J. Chem. Phys. 100, 1805 (1994)]. This perturbation manifested itself in the present work by a significantly longer lifetime of the 2Π3/2(10.5) level relative to other B,0 levels. The same effect was observed for the B,v=3 2Π1/2(17.5) level. The S/O interaction matrix element is estimated to be very small ((approximately-equal-to)10−2–10−3 cm−1). The perturbed level pairs must therefore be in very close, accidental coincidence. This was used for a precise determination of the term energy of the a 4Π state as T0(a 4Π)=38 266.74±0.03 cm−1.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.466534
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  • 9
    Electronic Resource
    Electronic Resource
    Intramolecular collisional transfer in NO (a 4Π→B 2Π, b 4Σ−): Gateway-type, resonant versus direct, nonresonant mechanisms (1994)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 100 (1994), S. 1805-1814 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: A beam containing NO in the long-lived a 4Π state was allowed to interact with target particles in a collision cell. Intramolecular collision-induced transitions a 4Π→B 2Π and a 4Π→b 4Σ− were observed via the subsequent emissions in the β bands (B 2Π→X 2Π) and the Ogawa bands (b 4Σ−→a 4Π), respectively. In the ultraviolet part of the spectrum long β band progressions originating from the B-state vibrational levels v=0 and 3 were observed. In each band only a few lines appear, which were assigned to transitions from the rotational levels 2Π3/2(10.5) in v=0 and 2Π1/2(17.5) in v=3. These particular B 2Π levels are perturbed by specific levels of the a 4Π state, serving as so-called gateways to allow the otherwise spin-forbidden a 4Π→B 2Π collision-induced transition. An external magnetic field has a strong effect on the collision-induced emission from the NO(B, v=0) level. With paramagnetic target gases, direct spin-changing NO(a→B) collisional transfer was also observed in addition to the gateway transitions. The selectivity for the final state level is much weaker here. The collision-induced Ogawa band emission in the near-infrared showed smooth, partially resolved rotational contours with all target gases. This indicates that the collisional transfer NO(a→b) within the quartet system is also not of the highly restrictive gateway type, but results from direct collisional coupling.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.466533
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  • 10
    Electronic Resource
    Electronic Resource
    Molecular Beam Study of the Collision-Induced Intramolecular Energy Transfer CO(a3.PI. .fwdarw. a'3.SIGMA.+, d3.DELTA.) (1995)
    s.l. : American Chemical Society
    The @journal of physical chemistry 〈Washington, DC〉 99 (1995), S. 15642-15654 
    Details
    Source: ACS Legacy Archives
    Topics: Chemistry and Pharmacology , Physics
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1021/j100042a046
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