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  • 1
    Electronic Resource
    Electronic Resource
    High resolution Fourier spectroscopy and laser spectroscopy of Cs2: The 2 1Σ+g, (C) 2 1Πu, (D) 2 1Σ+u, 3 1Σ+g, and (E) 3 1Σ+u electronic states (1988)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 88 (1988), S. 5265-5281 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: More than 8000 completely resolved rotational lines in the E 1Σ+u →X 1Σ+g, E 1Σ+g →(2)1Σ+g, E 1Σ+u →(1)1Πg, E 1Σ+u →(3)1Σ+g, D 1Σ+u →(2)1Σ+g, C 1Σu →X 1Σ+g, and D 1Σ+u →X 1Σ+g transitions of Cs2 have been accurately measured with the techniques of Fourier transform spectroscopy, Doppler-free polarization spectroscopy, and optical optical double resonance. The wave numbers of all these rotational lines were determined with an accuracy of 1 to 5×10−3 cm−1. A thorough and simultaneous analysis of all the measured data yields molecular constants, potential energy curves, and dissociation energies for six different excited electronic states of the Cs2 molecule.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.454755
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  • 2
    Electronic Resource
    Electronic Resource
    Laser-reduced fluorescence spectroscopy on predissociated CO triplet states (1994)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 101 (1994), S. 104-110 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: Triplet states of the CO molecule in the region between 86 000 and 94 000 cm−1 have been investigated in a 1+1 double-resonance experiment using a detection scheme based on laser-reduced fluorescence (LRF). The strongly predissociated (3pσ) j 3Σ+ Rydberg state at 90 833 cm−1 with an average lifetime of 4.6 ps has been observed spectroscopically at high resolution for the first time, providing a clear identification of this state. Both the accidental predissociation of the Jf=6 level of CO (E 1Π, v=0) and the value of the lambda-doubling constant q of the c 3Π state can be attributed to j 3Σ+. In addition, a valence state around 91 960 cm−1 has been identified as 3Π. Accurate molecular constants have been determined for both states.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.468184
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  • 3
    Electronic Resource
    Electronic Resource
    Laser-reduced fluorescence study of the carbon monoxide nd triplet Rydberg series: Experimental results and multichannel quantum defect analysis (1996)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 104 (1996), S. 8913-8921 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: The ndσ and ndδ (n=4...9, v=0) triplet Rydberg series of carbon monoxide have been observed for the first time and rotationally resolved with an accuracy of 0.03 cm−1 using a three-step excitation scheme. A multichannel quantum defect theory (MQDT) analysis shows strong perturbations for n=5, 8, and 9 and predicts the positions of the sσ and dπ levels. There is significant mixing between the sσ and dσ states, with a mixing angle between 42 and 45 degrees, as well as some smaller interaction with the np series. The ionization limit for CO is found to be 113 027.5(3) cm−1. © 1996 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.471625
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  • 4
    Electronic Resource
    Electronic Resource
    Spectroscopic study of the E 1Σ+g "shelf'' state in 7Li2 (1987)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 87 (1987), S. 861-868 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: The E 1Σ+g "shelf '' state of the 7Li2 molecule was investigated using a pulsed optical optical double resonance technique. The measurements cover the vibrational levels in the range 0≤v≤29 including the shelf region around 13≤v≤15. Molecular constants have been determined. Using an inverted perturbation approach, an effective potential energy curve has been generated within the adiabatic approximation whose quantum mechanical energy eigenvalues reproduce all the measured term values to within 0.113 cm−1 for the range 0≤v≤23 and 0≤J≤47.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.453293
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  • 5
    Electronic Resource
    Electronic Resource
    Lifetimes of the CO metastable a 3Π(v≤3,Ω,J) levels (1999)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 110 (1999), S. 6319-6328 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: We reanalyze the theoretical lifetimes of the metastable a 3Π(v=0,Ω,J) levels as well as the spontaneous a 3Π(v=0) decay rates into the X 1Σ+(v) ground state levels, clearly favoring the measurements of Jongma et al. [J. Chem. Phys. 107, 7034 (1997)] as compared to the theoretical results of James [J. Chem. Phys. 55, 4118 (1971)]. Theoretical lifetimes of the vibrationally higher lying metastable levels a 3Π(v=1–3,Ω,J) are listed for the first time. The lifetimes of the two Λ components are shown to be different. A new technique for measuring the lifetime of individual rovibrational metastable molecular levels is applied to the CO rovibrational level a 3Π(v=3,Ω=1,J=2). Our result τ=3.04±0.38 ms is in good agreement with the theoretical lifetime of 2.97 ms. The metastable population is deduced to be Nmeta=(2.3±1.2)⋅106 molecules/shot. Finally, our ms lifetime measurement technique is compared with that developed by Jongma et al. [J. Chem. Phys. 107, 7034 (1997)]. © 1999 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.478536
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  • 6
    Electronic Resource
    Electronic Resource
    Radiative lifetimes of selected rovibronic triplet levels of the CO molecule (1987)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 86 (1987), S. 62-70 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: Radiative lifetimes of individual rovibronic levels of the perturbed a' 3Σ+(v=14) and the e 3Σ−(v=5) states of the CO molecule have been measured under collision-free conditions using state selective excitation and measuring the temporal decay of the subsequent fluorescence. The accuracy of the measurements was typically 3% to 5%. The unperturbed triplet lifetimes and the corresponding spin-orbit interaction constants have been determined. Excellent agreement was found between the measured and the calculated lifetimes based on data of Field and co-workers. It is also shown that under favorable conditions lifetime measurements are significantly more sensitive to the mixing coefficients ||β||2 than wavelength measurements.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.452592
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  • 7
    Electronic Resource
    Electronic Resource
    Measurement of 10−1 s state-specific lifetimes in the neutral CO molecule (2000)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 112 (2000), S. 5320-5324 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: Recently, a technique has been demonstrated which allows the measurement of metastable lifetimes in neutral molecules of up to 10−3 s [J. Chem. Phys. 110, 6319 (1999)]. The present article extends the method by two orders-of-magnitude to molecular lifetimes as long as 10−1 s. Using the CO metastable a 3Π state, lifetimes of eight rovibrational a 3Π(v=3,Ω,J) levels were measured. Within their experimental error of 30%, these lifetimes agree with previous theoretical predictions [J. Chem. Phys. 110, 6319 (1999)]. The presented technique is suggested for identification of molecular quintet states, in particular the CO a″ 5Π state. © 2000 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.481124
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  • 8
    Electronic Resource
    Electronic Resource
    Electron impact dissociative ionization of CO2: Measurements with a focusing time-of-flight mass spectrometer (1998)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 108 (1998), S. 927-936 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: For reliable cross section data a focusing time-of-flight mass spectrometer has been presented which collects all the ions produced by the electron impact dissociative ionization of molecules. The focusing characteristic of the mass spectrometer generates the ions close to the axis and focuses the energetic ions back to the detector. By observing the deflection curves we can measure the cross sections conclusively. The complete collection allows one to extract the initial kinetic energy distribution of the ions from the time-of-flight profiles of the mass peaks. As a first example we measured the cross sections of electron impact dissociative ionization of CO2 for electron energies from threshold to 300 eV. The results agree very well with recent measurements of Straub et al. [J. Chem. Phys. 105, 4015 (1996)], although previous data are in very poor agreement with each other. We measured the initial translational energy distribution of the fragment ions from the dissociative ionization of CO2 . With respect to the kinetic energy distribution of the ions we analyzed the techniques which make use of the quadrupole mass spectrometer. We discuss why the results from the quadrupole mass spectrometer underestimate the cross sections for the fragment ions. Finally we suggest to recheck the data from earlier quadrupole mass spectrometer measurements. © 1998 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.475456
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  • 9
    Electronic Resource
    Electronic Resource
    Interaction of a magnetic field with the a′3Σ+–A1Π complex in CO (1998)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 108 (1998), S. 6320-6330 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: A theory describing the effects of a DC magnetic field on a 3Σ+−1Π complex includes the influence on the energy positions of the 3Σ+ rovibrational levels, the change of their lifetimes as well as the strength of the 3Σ+←1Σ+ intercombination transitions. This is measured on the a′3Σ+(v=14)←X1Σ+(v=0) transition in CO where strong zero field mixing of the a′3Σ+(v=14) state with the A1Π(v=4) state occurs through spin-orbit coupling. a′←X excitation spectra are taken under fields of up to 1 Tesla. Lifetimes of various a′(v=14),N,Fi rotational levels are measured as a function of a magnetic field, where changes as large as 30% reveal a strong influence of the field on the mixing with the A1Π(v=4) state. A change in the singlet character of the a′3Σ+(v=14),N,Fi rovibrational levels alters the line intensities of their forbidden a′←X transition which arises due to intensity borrowing from the allowed A←X transition. From the measured lifetime values at 1 Tesla the changes in line intensities as well as absolute oscillator strengths for several a′(v=14)←X(v=0) rotational lines are derived. An increase in population transfer from X1Σ+(v=0),J to a′3Σ+(v=14),N,Fi of up to 51% is deduced. Finally, the energy levels and the lifetimes of the a′(v=14),N,Fi rotational levels in the high field regime beyond 4 Tesla are discussed. © 1998 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.476064
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  • 10
    Electronic Resource
    Electronic Resource
    Electron impact dissociative ionization of ethane: Cross sections, appearance potentials, and dissociation pathways (1998)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 109 (1998), S. 1704-1712 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: Cross sections of the electron impact ionization as well as the dissociative ionizations of ethane have been measured for electron energies from threshold to 600 eV. The complete collection of all the ionic fragments has been verified directly in the experiment. The results are thus believed to be reliable. The results for the products of Hn+(n=1–3) are obtained for the first time. The appearance potentials of the ionic products are also measured. The disagreement with respect to the appearance potentials between the present work and previous measurements is explained by the dipole-forbidden transitions in the electron impact excitation process. The starting channels for the ionic products are discussed based on the appearance potentials, the kinetic energy distributions of the ionic products, and the ejection of the electrons out of the different orbitals of the ethane molecule. © 1998 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.476743
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