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Numerous rotational lines of the {18.26}1-X¹S+ band system of thorium sulfide, ThS, were recorded near 547.6 nm at a resolution of approximately 30 MHz. Measurements were made under field-free conditions, and in the presence of a static electric field. The field-free spectrum was analyzed to produce rotational and ?-doubling parameters. The Stark shifts induced by the electric field were analyzed to determine permanent electric dipole moments, µel, of 4.58(10) D and 6.72(5) D for the X¹S+ (v = 0) and {18.26}1 states, respectively. The results are compared with the predictions of previous and new electronic structure calculations for ThS, and the properties of isovalent ThO. [ABSTRACT FROM AUTHOR]

The B1A′′(000)←X1A′(000) band system of a cold beam of CuOH has been studied field-free and in the presence of a static electric field. The Stark tuning of the low-J levels of the X1A′(000) state were analyzed to give a value of 3.968(32) D for the a-component of the permanent electric dipole moment, μa. An upper limit of 0.3 D for μa(B1A′′) is established from the lack of observable Stark tuning for the low-J levels of the B1A′′(000) state. The experimental value for μa(X1A′) is compared to theoretical predictions and other Cu-containing molecules. A molecular orbital correlation diagram is used to rationalize the large change in μa upon excitation. The electronegativity of OH was determined to be 2.81 from a comparison of the determined μa with the experimental μ values for CuF, CuO, and CuS. [ABSTRACT FROM AUTHOR]

The low-rotational levels of the b 3Π-X 1∑+(0,0) band of copper monofluoride, CuF, were recorded field free and in the presence of a static electric field. The field-free spectrum was analyzed to produce a refined set of fine and hyperfine parameters for the b 3Π(v=0) state. The permanent electric dipole moment, μ, for the b 3Π(v=0) and X 1∑+(v=0) states were determined to be 2.36(2) and 5.26(2) D, respectively, from the analysis of the observed Stark shifts. The experimental μ values are compared to theoretical predictions. The change in μ upon excitation and the hyperfine parameters are discussed in terms of the proposed electronic configuration for the b 3Π and X 1∑+ states. The optical Stark spectroscopy of the A 2Π3/2-X 2∑+(0,0) subband of YO was also recorded and analyzed to precisely calibrate the electric field strength. The determined μ values are 3.714(5) and 4.542(40) D for the A 2Π3/2(v=0) and X 2∑+(v=0) states, respectively. [ABSTRACT FROM AUTHOR]

Permanent electric dipole moments and magnetic g factors for uranium monoxide (UO) have been determined from analyses of optical Stark and Zeeman spectra recorded at a spectral resolution that approaches the natural linewidth limit. Numerous branch features in the previously characterized [L. A. Kaledin et al., J. Mol. Spectrosc. 164, 27 (1994)] (0,0) [18403]5-X(1)4 and (0,0) [18404]5-X(1)4 electronic transitions were recorded in the presence of tunable static electric (Stark effect) or magnetic (Zeeman effect) fields. The lines exhibited unusually large Zeeman tuning effects. A ligand field model and an ab initio electronic structure calculation [R. Tyagi, Ph.D. thesis, The Ohio State University (2005)] were used to interpret the ground state properties. The results indicate that the low energy electronic states of UO are sufficiently ionic for the meaningful application of ligand field theory models. The dipole moments and g factors were distinctly different for the three electronic states examined, which implies that these properties may be used to deduce the underlying electronic state configurations. [ABSTRACT FROM AUTHOR]

The optical Stark effect has been measured for the &Btilde; ²Σ[sup +] - &Xmacr; ²Σ[sup +], 3[sub 0]¹, and 2[sub 0]¹(P' = 3/2) bands of lanthanum imide, LaNH, prepared in a supersonic molecular beam. The permanent electric dipole moment, μ, for the &Xtilde;²Σ[sup +] state was determined to be 2.53 ± 0.06 D from measurements of the second-order Stark shifts in the &Btilde; ²Σ[sup +] - &Xtilde;²Σ[sup +], 3[sub 0]¹ band. (ν[sub 3] is the La-N stretching vibration, of symmetry σ[sup +].) The dipole moment in the &Btilde; ²Σ[sup +] state is too small to be determined from the Stark shifts in this band, but could be determined from the first-order Stark splittings in the P' = 3/2 component of the B ²Σ[sup +], 2¹ bending fundamental (of upper state π symmetry); it was found to be 0.3 ± 0.2 D. A comparison is made with LaO and other isovalent molecules involving Group IIIA atoms. [ABSTRACT FROM AUTHOR]

The Stark effect of the R(2), Q(2) and P(3) lines of the Ω’=2-X 5 Δ2 subband of the ‘‘orange’’ system of iron monoxide at 5919 Å has been measured. Values for the permanent electric dipole moments μ of 4.7±0.2 and 2.6±0.2 D for the ground and excited electronic states, respectively, were derived from the analysis of the Stark shift. The results are discussed in terms of the various bonding models and compared with theoretical estimates. [ABSTRACT FROM AUTHOR]

Provides information on a study that examined the Stark effect in the band system of TiO using a sub-Doppler optical technique. Methodology of the study; Results and discussion on the study.

Provides an overview on the measurement of the Stark effect using the technique of high resolution laser induced fluorescence spectroscopy. Benefits of advances in supersonic molecular beam production; Differing predictions for the energy ordering and the nature of the low-lying electronic states.

The (6,0)[16.0]1.5–X2Δ5/2and (7,0)[16.0]3.5–X2Δ5/2bands of IrSi have been recorded using high-resolutionlaser-induced fluorescence spectroscopy. The field-free spectra ofthe 191IrSi and 193IrSi isotopologues were modeledto generate a set of fine, magnetic hyperfine, and nuclear quadrupolehyperfine parameters for the X2Δ5/2(v= 0), [16.0]1.5(v= 6), and [16.0]3.5(v= 7) states. The observed optical Stark shiftsfor the 193IrSi and 191IrSi isotopologues wereanalyzed to produce the permanent electric dipole moments, μel, of −0.414(6) D and 0.782(6) D for the X2Δ5/2and [16.0]1.5 (v= 6) states,respectively. Properties of the X2Δ5/2state computed using relativistic coupled-cluster methods clearlyindicate that electron correlation plays an essential role. Specifically,inclusion of correlation changes the sign of the dipole moment andis essential for achieving good accuracy for the nuclear quadrupolecoupling parameter eQq0. [ABSTRACT FROM AUTHOR]

Abstract: The (000)← (000) system of a cold beam of barium hydroxide, BaOH, has been studied field-free and in the presence of a static electric field. Stark tuning of the low-J branch features in the (000)← (000) transition were analyzed to give permanent electric dipole moments, μ, for the (000) and (000) states of 0.477(7) D and 1.43(4) D, respectively. The results are compared with other alkaline earth monohydroxides and values predicted using an electrostatic polarization model and ligand field theory. [Copyright &y& Elsevier]

Stark shifts in the (0,0) bands of the [12.7] 3Π2–[0.1] 3Δ3 and [13.9] 3Π1–[0.9] 3Δ2 systems of 102RuC were analyzed to produce the magnitude of the permanent electric dipole moments, |μ|, for RuC in the [0.1] 3Δ3, [0.9] 3Δ3, [12.7] 3Π2, and [13.9] 3Π1 states of 1.95(2), 1.86(2), 3.58(3) and 3.44(3) D, respectively. A comparison is made with ab initio predictions for RuC, and with experimental results for isovalent FeC and with RuN. [Copyright &y& Elsevier]

Abstract: The R(0) and R(1) lines of the (3,0) A 1Σ+–X 1Σ+ band of the major isotopologue of barium sulfide, 138Ba32S, were recorded at high resolution (full width at half maximum ≅35MHz) and at a field strength of up to 3100V/cm. The observed Stark shifts were analyzed to produce permanent electric dipole moments, , of 10.765(8)D and 5.586(22) for the X 1Σ+ (v =0) and A 1Σ+ (v =3) states, respectively. The relative values of for barium monoxide, BaO, and BaS are discussed. [Copyright &y& Elsevier]

Abstract: The optical Stark spectrum of the A 1Σ–X 1Σ+(0,0) band of BaO was recorded and analyzed to determine the permanent electric dipole moments, μ, for the A 1Σ(ν =0) and X 1Σ+(ν =0) states to be 3.125(16)D and 7.869(17)D, respectively. The molecular beam electric resonance data for the X 1Σ+(ν =0) states [L. Wharton, M. Kaufman, W. Klemperer, J. Chem. Phys. 37 (1962) 621] was re-analyzed to produce μ of 7.9530(4)D. The systematic difference between the MBER and optical Stark values is discussed. [Copyright &y& Elsevier]