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  • 1
    Electronic Resource
    Electronic Resource
    Infrared photodissociation of size-selected methylamine clusters (1991)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 94 (1991), S. 23-29 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: Infrared photodissociation spectra of (CH3NH2)n clusters were measured from n=2 to n=6 near the absorption of the C–N stretching mode of the monomer at 1044 cm−1 using a line tunable cw CO2 laser. The clusters are size selected by scattering them from a helium beam. The dimer spectrum shows a double-peak structure with a red- (1038 cm−1) and a blue- (1048 cm−1) shifted peak which is attributed to the nonequivalent position of the C–N in the open dimer structure. The larger clusters exhibit only one peak between 1045.4 and 1046.0 cm−1 which is caused by the equivalent position of the C–N in the cyclic structures of the larger clusters. Calculations of the minimum-energy configurations confirm these results. The linewidth increases by more than a factor of 3 for cold and internally excited dimers.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.460382
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  • 2
    Electronic Resource
    Electronic Resource
    Reply to the comment on: "Electron bombardment fragmentation of size selected NH3 clusters'' (1990)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 93 (1990), S. 3726-3727 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: The experiments reported in Ref.1 were repeated with size−selected clusters of ammonia. It was concluded from the results of these experiments that the missing ion intensity maxima in ammonia cluster spectra is a cosequence of the cluster size and not, as was stated in Ref.3, of the beam conditions.(AIP)
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.458808
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  • 3
    Electronic Resource
    Electronic Resource
    The A 3Σ−–X 3Σ− electronic transition of HC6N (2001)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 114 (2001), S. 7918-7922 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: A combined matrix and gas phase study is presented to identify the A 3Σ−–X 3Σ− electronic transition of the linear triplet isomer of HC6N and isotopic derivative DC6N. Absorption spectra have been observed in a 6 K neon matrix after mass selective deposition and in the gas phase by cavity ring down spectroscopy through a supersonic planar plasma. The band origin of the 000 A 3Σ−–X 3Σ− electronic transition of HC6N is determined to be at 21 208.60(5) cm−1, shifted ∼30 cm−1 to the blue of the neon matrix value. Rotational analysis indicates that the chain is slightly stretched on electronic excitation, yielding B0′=0.027 92(5) cm−1. Transitions to vibrationally excited levels in the upper A 3Σ− state are observed as well. The results are compared with a rotationally resolved spectrum of the 000 A 3Σu−–X 3Σg− electronic transition of the isoelectronic HC7H species. © 2001 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.1361254
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  • 4
    Electronic Resource
    Electronic Resource
    The 3Σu−←X 3Σg− electronic spectrum of linear C4 in the gas phase (2000)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 112 (2000), S. 9777-9779 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: The 3Σu−←X 3Σg− electronic absorption spectrum of linear C4 has been detected in the gas phase. The origin and several vibronic transitions have been recorded by means of cavity ring down spectroscopy through a supersonic planar plasma. The origin band is found at 26 384.9(2) cm−1 (∼379 nm). A partly rotationally resolved origin band spectrum yields a value of B0′=0.1570(5) cm−1 for the electronically excited 3Σu− state. © 2000 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.481615
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  • 5
    Electronic Resource
    Electronic Resource
    Cavity ring down spectroscopy on radicals in a supersonic slit nozzle discharge (1999)
    [S.l.] : American Institute of Physics (AIP)
    Review of Scientific Instruments 70 (1999), S. 1305-1312 
    Details
    ISSN: 1089-7623
    Source: AIP Digital Archive
    Topics: Physics , Electrical Engineering, Measurement and Control Technology
    Notes: A sensitive and generally applicable technique for direct absorption spectroscopy on electronic transitions of transient species in the gas phase is presented. The method is based on cavity ring down spectroscopy in a pulsed slit nozzle, incorporating a discharge in a high pressure supersonic expansion. The performance is demonstrated with spectra of the 000 origin band of the 2Π←X2Π electronic transition of the isoelectronic linear carbon chain radicals C6H and C6H2+. Rotationally resolved and rotationally cold spectra (Trot〈15 K) have been obtained. The sensitivity of the technique is demonstrated for anions with a detection limit as low as 107 C2− molecules cm−3 for rovibrational transitions of the B2Σu+←X2Σg+ system. © 1999 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.1149589
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  • 6
    Electronic Resource
    Electronic Resource
    Spectroscopic and theoretical characterization of linear centrosymmetric N(Triple Bond)N⋅⋅H+⋅⋅N(Triple Bond)N (1999)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 111 (1999), S. 8400-8403 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: The first high resolution infrared spectrum of the ionic complex N2⋅⋅H+⋅⋅N2 and its deuterated derivative is reported. The spectra were obtained in direct absorption in a supersonic slit nozzle plasma. The observed rovibrational transitions were assigned to the ν3 antisymmetric NN stretching vibration and the spectrum is consistent with a linear centrosymmetric equilibrium structure. The band origin is found at 2352.2364(6) cm−1 and the ground state rotational constant is determined as B″=0.081 809(14) cm−1. The assignment is supported by ab initio calculations including electron correlation effects. The best estimate for the equilibrium structure is Re (NN)=1.095 Å and re (N⋅⋅H)=1.277 Å. The transition moment of the ν3 band of N2⋅⋅H+⋅⋅N2 is predicted to be 0.21 D, an order of magnitude larger than for the NN stretching vibration of HN2+. The equilibrium dissociation energy De for fragmentation into N2 and HN2+ is calculated to be ∼5900 cm−1. © 1999 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.480181
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  • 7
    Electronic Resource
    Electronic Resource
    Stark effect and dipole moments of the ammonia dimer in different vibration–rotation–tunneling states (1996)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 104 (1996), S. 3898-3906 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: In this paper we present Stark measurements on the G:K=−1 vibration–rotation–tunneling (VRT) transition, band origin 747.2 GHz, of the ammonia dimer. The observed splitting pattern and selection rules can be explained by considering the G36 and G144 symmetries of the inversion states involved, and almost complete mixing of these states by the applied electric field. The absolute values of the electric dipole moments of the ground and excited state are determined to be 0.763(15) and 0.365(10) D, respectively. From the theoretical analysis and the observed selection rules it is possible to establish that the dipole moments of the two interchange states must have opposite sign. The theoretical calculations are in good agreement with the experimental results: The calculated dipole moments are −0.74 D for the lower and +0.35 D for the higher state. Our results, in combination with the earlier dipole measurements on the G:K=0 ground state and the G:K=1 transition with band origin 486.8 GHz, confirm that the ammonia dimer is highly nonrigid. Its relatively small and strongly K-dependent dipole moment, which changes sign upon far-infrared excitation, originates from the difference in dynamical behavior of ortho and para NH3. © 1996 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.471246
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  • 8
    Electronic Resource
    Electronic Resource
    Rotationally resolved A˜ 2Πg←X˜ 2Πu electronic spectrum of triacetylene cation by frequency modulation absorption spectroscopy (1999)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 110 (1999), S. 296-303 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: The spectrum of the A˜ 2Πg←X˜ 2Πu 000 band system of the triacetylene cation and isotopic derivatives DC6H+ and C6D2+ have been studied at Doppler-limited resolution using frequency modulation absorption spectroscopy. The ions were generated in a liquid-nitrogen-cooled hollow cathode discharge incorporated in a White cell. A discharge modulation in combination with the frequency modulation technique was used to enhance the detection sensitivity. Analyses of the rotational structure yield accurate rotational and spin-orbit interaction constants of triacetylene cation in the two electronic states and information on its geometry. © 1999 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.478065
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  • 9
    Electronic Resource
    Electronic Resource
    The 2Π←X 2Π electronic spectra of C8H and C10H in the gas phase (1998)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 109 (1998), S. 3819-3823 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: The 2Π←X 2Π electronic transition of linear C8H/C8D and C10H/C10D has been detected in the gas phase. The carbon radical chains were produced at low temperatures in a pulsed slit nozzle, incorporating a discharge in a high pressure expansion. Cavity ring down spectroscopy is used as a sensitive technique to observe the band systems in absorption. The 000 band of the 2Π3/2←X 2Π3/2 electronic transition of C8H in the gas phase has its origin near 15 973.5 cm−1, whereas that of C10H is around 14 000 cm−1. Some transitions involving vibrational excitation in the upper 2Π electronic state have been also detected. These measurements were undertaken because carbon chains are among the appealing candidates as carriers of diffuse interstellar bands; the observed origin bands do not show matches with the hitherto reported wavelengths. However, these gas phase data now provide a firm basis for a specific astronomical search. © 1998 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.476981
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  • 10
    Electronic Resource
    Electronic Resource
    Infrared absorption spectrum of Ar–HN2+ in a supersonic slit expansion (1997)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 107 (1997), S. 8706-8708 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: The first direct measurement of a high resolution infrared absorption spectrum of an ionic complex, Ar–HN2+, is presented. The complex is generated in a continuous supersonic slit jet expansion with electron impact ionization. There have been observed 28 rotationally resolved transitions of the ν1+νs combination band in the 2501–2510 cm−1 region using a tunable diode laser. The band origin is determined at ν0=2505.4998(4) cm−1. © 1997 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.475023
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