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  • 2000-2004  (3)
  • 1990-1994  (11)
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  • 1
    Electronic Resource
    Electronic Resource
    The B←X electronic spectrum of N+2–Ne (1991)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 94 (1991), S. 4749-4755 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: The electronic spectrum of N+2–Ne has been measured in the region corresponding to the B 2∑+u←X 2∑+g origin and 1–0 transitions of N+2. Spectra were obtained by irradiating a mass selected population of N+2–Ne and monitoring the production of N+2 as a function of wavelength. Low temperature N+2–Ne spectra exhibit several well resolved bands. From the shift of the N+2–Ne origin with respect to that of free N+2 it is apparent that the complex dissociation energy D0 is 146.5 cm−1 greater in the B state than the X state. Pronounced changes in the complex's spectrum occur as the effective temperature is increased. The hottest spectra resemble a broadened and truncated N+2 spectrum. The breaking off at the high energy end of the spectrum at elevated temperatures allows us to establish a rough ground-state dissociation energy of 300 cm−1. Other conclusions resulting from this work are that the equilibrium geometry of the N+2–Ne molecule is probably linear in X and B electronic states, that the ΔG1/2 for the low frequency stretch in the B state is 104 cm−1, and that the N–N stretching motion is affected only very weakly by the presence of the Ne atom.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.460737
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  • 2
    Electronic Resource
    Electronic Resource
    The B←X electronic spectrum of N2+–He (1990)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 93 (1990), S. 4477-4478 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: The electronic spectrum of N2+–He has been measured in the region corresponding to the N2+ B 2Σ+u←X 2Σ+g origin transition. The spectrum was recorded by photoexciting a mass selected beam of N2+–He ions and detecting N2+ fragments. A likely process for the fragmentation involves fluorescence to a vibrationally excited level of the ground electronic state followed by vibrational predissociation. The observed spectrum exhibits well resolved discrete structure and bears a remarkable resemblance to a cold N2+ spectrum suggesting that the potential between the N2+ ion and helium atom in both the X and B electronic states, has at most only a small barrier to internal rotation. Measurement of the shift of N2+–He transitions with respect to the corresponding N2+ lines indicates that the binding energy of the helium atom to the N2+ ion is almost the same in both the B and X electronic states.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.458732
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  • 3
    Electronic Resource
    Electronic Resource
    Vibrational predissociation lifetime of N2+–He (X, υ=1) (1992)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 96 (1992), S. 4035-4036 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: The B←X spectrum of N+2–He exhibits a hot band which arises from transitions in complexes which have one quantum of the N–N stretching vibration. By measuring the intensity of this peak relative to that of the origin peak as function of the time between ion preparation and laser interrogation we have determined the vibrational predissociation lifetime of the N+2–He complex to be 220±30 μs.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.461855
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  • 4
    Electronic Resource
    Electronic Resource
    Photoinitiated charge transfer in N2O+–Ar (1992)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 96 (1992), S. 7535-7541 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: Vibrationally structured electronic transitions of N2O+–Ar have been observed by measuring the wavelength-dependent yields of the photodissociation reactions to yield N2O+ or Ar+. There appear to be four structured overlapping electronic band systems which are distinguished by vibrational spacings and by their propensity towards production of either N2O+ or Ar+. Variations in the Ar+/N2O+ photoproduct ratio with wavelength are explained as due to vibrational predissociation on different potential-energy surfaces correlating with either Ar+ or N2O+ products. The first band system, observed exclusively at the N2O mass, has its origin close to 445 nm, corresponding approximately to the difference in the energies of N2O+[X 2Π3/2]+Ar[1S0] and N2O[1Σ+]+Ar+[2P3/2] and is assigned as an intracluster charge-transfer transition. Two strong band systems situated to higher energy are assigned as transitions to the two additional electronic states which are expected to correlate with 2P3/2 and 2P1/2 Ar+ and N2O[1Σ+] products. While excitation of these two bands results almost exclusively in Ar+ production, a fourth weaker band near 342 nm leads to N2O+ and appears likely to be a transition to a state correlating with an excited vibronic state of N2O+[A 2Σ+(1,0,0)]+Ar[1S0]. The different band systems exhibit extensive vibrational progressions involving the deformation of the bond between the N2O and the Ar. The shift in the onset of the first charge transfer from the difference in the Ar and N2O ionization potentials combined with the appearance energy for Ar+ production allow tentative estimates of 690 and 1340 cm−1 to be made for the dissociation energies of the lowest and first excited states of N2O+–Ar.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.462405
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  • 5
    Electronic Resource
    Electronic Resource
    Electronic spectra of N+2–(He)n (n=1, 2, 3) (1992)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 96 (1992), S. 28-34 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: Ionic clusters of nitrogen and helium have been investigated by recording their electronic spectra in the near UV. Structured bands belonging to 14N+2 –He, 14N+2–(He)2, 14N+2–(He)3, and 15N+2 –He have been measured between 390 and 392 nm close to the N+2 B 2Σ+u←X 2Σ+g band origin. Spectra were obtained by exciting mass selected cluster cations with tunable laser radiation and recording the photodissociation cross section as a function of wavelength. The data support the hypothesis that the He– – –N+2 interaction potential has only a small barrier to internal rotation in both the X and B electronic states. A lower estimate for the dissociation energy of the N+2 –He cluster of 101 cm−1 is inferred.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.462517
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  • 6
    Electronic Resource
    Electronic Resource
    A 3.PI.u .rarw. X 3.SIGMA.g- Electronic Spectrum of N3+ (1994)
    s.l. : American Chemical Society
    The @journal of physical chemistry 〈Washington, DC〉 98 (1994), S. 8896-8902 
    Details
    Source: ACS Legacy Archives
    Topics: Chemistry and Pharmacology , Physics
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1021/j100087a013
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  • 7
    Electronic Resource
    Electronic Resource
    Photofragment spectroscopy and dissociation dynamics of N2+2: A 1Πu–X 1Σ+g (1994)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 100 (1994), S. 4766-4774 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: The 9–0 and 9–1 transitions of the A 1Πu–X 1Σ+g system of N2+2 have been observed by fast ion beam photofragment spectroscopy. Multireference configuration interaction ab initio calculations predict v'=8 to be the highest bound level which seemed to be supported by experimental evidence. The dominant predissociation mechanism for the v'=9 level appears to be through tunneling, unlike the v'=6, 7, and 8 levels, which show an e/f symmetry-dependent electronic predissociation. Calculated tunneling lifetimes from our own modified A 1Πu state potential gives good agreement with the experimental lifetimes. In addition to the 9–1 and 9–0 bands, we have also measured the previously unobserved 7–0 and 8–0 rovibronic transitions thus extending Cosby, Müller, and Helm's study to the blue [Phys. Rev. A 28, 766 (1983)]. Molecular constants have been determined for the v=0 of the X 1Σ+g state and v=7, 8, and 9 of the A 1Πu state.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.466267
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  • 8
    Electronic Resource
    Electronic Resource
    The B←X electronic spectra of N+2–Nen (1≤n≤8) (1994)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 100 (1994), S. 4156-4164 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: Spectra of 14N+2–20Ne, 14N+2–22Ne, and 15N+2–20Ne have been recorded in the region of the B 2Σ+u←X 2Σ+g origin transition of N+2. Measurements are made by mass selecting cooled ionic complexes and photodissociating them whilst monitoring the N+2 fragment ion intensity as the laser wavelength is scanned. Various bands are assigned to transitions involving the stretching and bending motions of the Ne...Ne+2 bond with their structure and spacings consistent with transitions between quasilinear geometries in the X and the B states. Spectra of complexes with up to eight neon atoms attached to a 14N+2 core have also been measured. Evidence from shifts of the band origins and analysis of the vibrational frequencies of N+2–Ne2 and N+2–Ne3 suggest a structure where the Ne ligands are sited at one end of the N+2 chromophore.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.466299
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  • 9
    Electronic Resource
    Electronic Resource
    Spectroscopic studies of ionic complexes and clusters (1993)
    s.l. : American Chemical Society
    Chemical reviews 93 (1993), S. 2603-2621 
    Details
    ISSN: 1520-6890
    Source: ACS Legacy Archives
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1021/cr00024a002
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  • 10
    Electronic Resource
    Electronic Resource
    Photodetachment spectroscopy of the C2nH− (n=2–4) anions in the vicinity of their electron detachment threshold (2002)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 116 (2002), S. 6126-6131 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: The electronic spectra of the C2nH(D)−, n=2–4, anions have been observed in the gas phase using photodetachment spectroscopy. These are assigned to 1Π←X 1Σ+ electronic transitions. The 1Π excited states possess a dipole bound character indicated by the energetic proximity between the origin of the transitions and electron affinities. The dipole bound states are related to the X 2Π ground states of C6H and C8H whereas for C4H, which has an X 2Σ+ ground state, the 2Π is an excited state. Vibronic coupling through a bending motion of the carbon skeleton is inferred to be the reason of the stabilization of this state. © 2002 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.1451248
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