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Observations Of High Vibrational Levels Of The 4fσ 41Σ+ U State Of H2, Alexander M. Chartrand, Robert C. Ekey Jr., Elizabeth F. Mccormack
Observations Of High Vibrational Levels Of The 4fσ 41Σ+ U State Of H2, Alexander M. Chartrand, Robert C. Ekey Jr., Elizabeth F. Mccormack
Physics Faculty Research and Scholarship
Resonantly enhanced multiphoton ionization via the EF 1Σg+, v′ = 6 double-well state has been used to probe the energy region below the third dissociation limit of H2 where several high vibrational levels of the 41Σu+ state are expected. Theoretical ab initio potential energy curves for this state predict a deep inner well and shallow outer well where vibrational levels above v = 8 are expected to exhibit the double-well character of the state. Since the 41Σu+ state has f-state character, transitions to it from the …
Observations Of The High Vibrational Levels Of The B′′B̄ 1Σu+ State Of H2, Alexander M. Chartrand, W. Duan, R. C. Ekey, Elizabeth Mccormack
Observations Of The High Vibrational Levels Of The B′′B̄ 1Σu+ State Of H2, Alexander M. Chartrand, W. Duan, R. C. Ekey, Elizabeth Mccormack
Physics Faculty Research and Scholarship
Double-resonance laser spectroscopy via the E F 1Σg+, v'=6, J'=0-2 state was used to probe the high vibrational levels of the B"B-bar 1Σu+ state of molecular hydrogen. Resonantly-enhanced multiphoton ionization spectra were recorded by detecting ion production as a function of energy using a time of flight mass spectrometer. New measurements of energies for the v=51-66 levels for the B"B-bar state of H2 are reported, which, taken with previous results, span the v=46-69 vibrational levels. Results for energy levels are compared to theoretical close-coupled calculations [L. Wolniewicz, T. …
Observations Of The High Vibrational Levels Of The B′′B̄ 1Σ+U State Of H2, A. M. Chartrand, W. Duan, R. C. Ekey, Elizabeth Mccormack
Observations Of The High Vibrational Levels Of The B′′B̄ 1Σ+U State Of H2, A. M. Chartrand, W. Duan, R. C. Ekey, Elizabeth Mccormack
Physics Faculty Research and Scholarship
Double-resonance laser spectroscopy via the E F 1Σ+g, v' = 6, J' = 0–2 state was used to probe the high vibrational levels of the B′′B̄ 1Σ+u state of molecular hydrogen. Resonantly enhanced multiphotonionization spectra were recorded by detecting ion production as a function of energy using a time of flight mass spectrometer. New measurements of energies for the v = 51–66 levels for the B00B ̄ state of H2 are reported, which, taken with previous results, span the v = 46–69 vibrational levels. Results for energy levels are compared to theoretical close-coupled …
Methyl And T-Butyl Group Rotation In A Molecular Solid: 1h Nmr Spin-Lattice Relaxation And X-Ray Diffraction, Peter A. Beckmann, Curtis E. Moore, Arnold L. Rheingold
Methyl And T-Butyl Group Rotation In A Molecular Solid: 1h Nmr Spin-Lattice Relaxation And X-Ray Diffraction, Peter A. Beckmann, Curtis E. Moore, Arnold L. Rheingold
Physics Faculty Research and Scholarship
We report solid state 1H nuclear magnetic resonance spin-lattice relaxation experiments and X-ray diffractometry in 2-t-butyldimethylsilyloxy-6-bromonaphthalene. This compound offers an opportunity to simultaneously investigate, and differentiate between, the rotations of a t-butyl group [C(CH3)3] and its three constituent methyl groups (CH3) and, simultaneously, a pair of 'lone' methyl groups (attached to the Si atom). The solid state 1H relaxation experiments determine activation energies for these rotations. We review the models for the dynamics of both 'lone' methyl groups (ones whose rotation axes do not move on the NMR time scale) and models for the dynamics of the t-butyl group and …
1h And 19f Spin-Lattice Relaxation And Ch3 Or Cf3 Reorientation In Molecular Solids Containing Both H And F Atoms, Peter A. Beckmann, Andrew L. Rheingold
1h And 19f Spin-Lattice Relaxation And Ch3 Or Cf3 Reorientation In Molecular Solids Containing Both H And F Atoms, Peter A. Beckmann, Andrew L. Rheingold
Physics Faculty Research and Scholarship
The dynamics of methyl (CH3) and fluoromethyl (CF3) groups in organic molecular (van der Waals) solids can be exploited to survey their local environments. We report solid state 1H and 19F spin-lattice relaxationexperiments in polycrystalline 3-trifluoromethoxycinnamic acid, along with an X-ray diffraction determination of the molecular and crystal structure, to investigate the intramolecular and intermolecular interactions that determine the properties that characterize the CF3 reorientation. The molecule is of no particular interest; it simply provides a motionless backbone (on the nuclear magnetic resonance (NMR) time scale) to investigate CF3reorientation occurring on the NMR time scale. The effects of 19F–19F and …