Lambda-type doubling parameters for molecules in Π electronic states of triplet and higher multiplicity

Brown, John M.; Merer, A. J.

doi:10.1016/0022-2852(79)90172-3

Cited by 220 publications

(107 citation statements)

References 14 publications

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“…This type of interaction is characterized by the parameter p in [51]. With esymmetry above f in 3 Π 0 and 3 Π 0 located below 3 Π 1 , we would expect e above f in 3 Π 1 , which corresponds to a negative value of k as observed.…”

Section: Resultsmentioning

confidence: 99%

Broadband velocity modulation spectroscopy of HfF+: Towards a measurement of the electron electric dipole moment

Cossel

Gresh

Sinclair

et al. 2012

Chemical Physics Letters

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Precision spectroscopy of trapped HfF + will be used in a search for the permanent electric dipole moment of the electron (eEDM). While this dipole moment has yet to be observed, various extensions to the standard model of particle physics (such as supersymmetry) predict values that are close to the current limit. We present extensive survey spectroscopy of 19 bands covering nearly 5000 cm −1 using both frequency-comb and single-frequency laser velocity-modulation spectroscopy. We obtain high-precision rovibrational constants for eight electronic states including those that will be necessary for state preparation and readout in an actual eEDM experiment.

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Section: Resultsmentioning

confidence: 99%

Broadband velocity modulation spectroscopy of HfF+: Towards a measurement of the electron electric dipole moment

Cossel

Gresh

Sinclair

et al. 2012

Chemical Physics Letters

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“…Note that Salumbides et al [25] have circumvented this systematic offset of the absolute calibration by putting a small pinhole in the pulsed beam, therewith selecting a portion of the laser beam with smaller wavefront distortions. We could not apply this method here, The effective Hamiltonian for a 3 Π state has been derived by several authors [10,26]. We have used the effective Hamiltonian from Field et al [10] with the additions and corrections discussed by Carballo et al [5].…”

Section: G Frequency Chirp In the Pulsed Laser Systemmentioning

confidence: 99%

“…The matrix elements for this effective Hamiltonian are listed in Table III. As discussed by Carballo et al [5], this Hamiltonian is equivalent to the effective Hamiltonian derived by Brown and Merer [26], but the molecular constants used in these Hamiltonians have a slightly different physical meaning, which will have consequences for the mass scaling discussed in Sec. VI B.…”

Section: G Frequency Chirp In the Pulsed Laser Systemmentioning

confidence: 99%

UV-frequency metrology on CO (a3Π): Isotope effects and sensitivity to a variation of the proton-to-electron mass ratio

et al. 2011

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UV frequency metrology has been performed on the a 3 Π -X 1 Σ + (0,0) band of various isotopologues of CO using a frequency-quadrupled injection-seeded narrow-band pulsed Titanium:Sapphire laser referenced to a frequency comb laser. The band origin is determined with an accuracy of 5 MHz (δν/ν = 3 · 10 −9 ), while the energy differences between rotational levels in the a 3 Π state are determined with an accuracy of 500 kHz. From these measurements, in combination with previously published radiofrequency and microwave data, a new set of molecular constants is obtained that describes the level structure of the a 3 Π state of 12 C 16 O and 13 C 16 O with improved accuracy. Transitions in the different isotopologues are well reproduced by scaling the molecular constants of 12 C 16 O via the common mass-scaling rules. Only the value of the band origin could not be scaled, indicative of a breakdown of the Born-Oppenheimer approximation. Our analysis confirms the extreme sensitivity of two-photon microwave transitions between nearly-degenerate rotational levels of different Ω-manifolds for probing a possible variation of the proton-to-electron mass ratio, µ = mp/me, on a laboratory time scale.

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“…31 The subscripts i and j refer to the values of ⍀ and only e-parity levels are considered here. Molecular constants for k 3 ⌸, vϭ5 were taken from Baker and Launay 17 and for E 1 ⌸, vϭ1 from Table I.…”

Section: Analysis Of the Predissociation Phenomenamentioning

confidence: 99%

Accidental predissociation phenomena in the E 1Π, v=0 and v=1 states of 12C16O and 13C16O

Cacciani

Hogervorst

Ubachs

1995

The Journal of Chemical Physics

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We have studied vϭ0 and vϭ1 levels of the E 1 ⌸ state of CO in excitation from the ground state by one-and two-photon transitions, thus probing e and f ⌳-doublet components. New accidental predissociations were found in the E 1 ⌸, vϭ0 state for high J values ͑J e ϭ41, 44 for 12 C 16 O and J e ϭ41, 50 for 13 C 16 O͒. The predissociation phenomenon in the E 1 ⌸, vϭ1 state at Jϭ7 was reinvestigated and for both e and f components also Jϭ9, 10, and 12 were found to be perturbed. Perturbations by all three spin components of a k 3 ⌸, vϭ5 state were deduced. Furthermore the accidental predissociation in E 1 ⌸, vϭ0 J e ϭ31 was reinvestigated. Measurements of spectral line shifts were modeled assuming a spin-orbit coupling between E 1 ⌸ and the 3 ⌸ 1 component of the k 3 ⌸ state. Relative predissociation lifetimes of k 3 ⌸, vϭ3 and 5 with respect to E 1 ⌸, vϭ0 and vϭ1 are deduced from an analysis of observed intensity effects. For the E 1 ⌸, vϭ1 state rotational state dependent lifetimes were determined at low-J values. Line positions of CO lines were calibrated on an absolute frequency scale within 0.05 cm Ϫ1 against the tellurium and iodine standard in the visible. Accurate molecular constants for the E 1 ⌸, vϭ0 and vϭ1 states are determined for both 12 C 16 O and 13 C 16 O. The E 1 ⌸, vϭ1 state of 12 C 17 O is observed for the first time.

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Lambda-type doubling parameters for molecules in Π electronic states of triplet and higher multiplicity

Cited by 220 publications

References 14 publications

Broadband velocity modulation spectroscopy of HfF+: Towards a measurement of the electron electric dipole moment

Broadband velocity modulation spectroscopy of HfF+: Towards a measurement of the electron electric dipole moment

UV-frequency metrology on CO (a3Π): Isotope effects and sensitivity to a variation of the proton-to-electron mass ratio

Accidental predissociation phenomena in the E 1Π, v=0 and v=1 states of 12C16O and 13C16O

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