Optical Zeeman Spectroscopy of the (0, 0) Bands of theB3Π–X3Δ andA3Φ–X3Δ Transitions of Titanium Monoxide, TiO

Virgo, Wilton L.; Steimle, Timothy C.; Brown, John M.

doi:10.1086/431282

Cited by 18 publications

(16 citation statements)

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“…In contrast, while Ω = 0 in the E 3 Π 0 state, the large Λ−doublet splitting indicates strong mixing with higher electronic excited states, and so by analogy with the B 3 Π 0 optical Zeeman measurements of [32], we estimate the magnetic moment to be ∼ 10 times that of the X 3 ∆ 1 . This, combined with the narrowness of the E 3 Π ↔ X 3 ∆ transition, implies that the dynamics of a TiO ER-MOT will have more in common with narrow-line alkaline-earth MOTs [33] than normal alkali metal MOTs.…”

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confidence: 75%

Magneto-optical Trap for Polar Molecules

et al. 2008

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We propose a method for laser cooling and trapping a substantial class of polar molecules, and in particular titanium (II) oxide (TiO). This method uses pulsed electric fields to nonadiabatically remix the ground-state magnetic sublevels of the molecule, allowing us to build a magneto-optical trap (MOT) based on a quasi-cycling J ′ = J ′′ − 1 transition. Monte-Carlo simulations of this electrostatically remixed MOT (ER-MOT) demonstrate the feasibility of cooling TiO to a temperature of 10 µK and trapping it with a radiation-pumping-limited lifetime on the order of 80 ms.PACS numbers: 37.10. Pq, 37.10.Mn, 37.10.Vz The field of ultracold polar molecules has recently made great strides. Coherent optical transfer of magneto-associated molecules can now produce ultracold molecular gases in the X 1 Σ (v = 0) ground state with densities of 10 12 cm −3 and translational temperatures of 350 nK [1]. Incoherent photoassociation techniques can reach the X 1 Σ (v = 0) ground state at 100 µK [2]. With these temperatures and the reasonably large electric dipole moments available from heteronuclear bialkali molecules (e. g. 0.76 D for X 1 Σ (v = 0) KRb [3]), progress towards quantum simulations of condensed matter systems [4,5] and quantum computation [6,7] should be rapid. In fields such as ultracold chemistry [8], access to molecular species beyond the bialkali family is of great interest. Arbitrary species can be cooled to the kelvin regime through buffer-gas cooling [9,10], while Stark deceleration [11,12] reaches the tens of millikelvin level for selected light molecules. Unfortunately, there is no demonstrated technique to further compress and cool the lukewarm molecular clouds resulting from the latter two techniques. Even cavitymediated schemes for molecular laser cooling [13,14,15,16], while in the abstract highly attractive methods for cooling a broad, chemically interesting set of molecules, have so far been unable to cool these lukewarm samples, due to the schemes' low scattering rates [15], small cavity mode volumes [16], and requirement of multiparticle collective effects [13,14].Direct, free-space laser cooling and trapping would be the ideal method for producing ultracold molecules, just as it is for atoms. Unfortunately, atoms are in general much easier to laser cool than molecules, due to the latter's glaring lack of cycling transitions. Laser cooling generally requires electronic transitions, as vibrational and rotational transitions have impractically long excited state lifetimes unless a cavity is used [16]. Unfortunately, these "electronic" transitions are never purely electronic. Rather, they are rovibronic, and decay into various rotational, vibrational, or hyperfine excited states, as well as the original ground state [17].The branching ratios of these rovibronic decays, however, are governed by the molecular structure and the dipole selection rules. This implies that a clever choice of molecule can greatly reduce the number of possible decays. Decays into excited hyperfine states are impossible in m...

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confidence: 75%

Magneto-optical Trap for Polar Molecules

et al. 2008

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“…The constrained g l value was obtained from the Curl relationship. The quantum number assignments of the field-free and Zeeman spectra were greatly assisted by modeling the spectra, the process of which has been described previously (Steimle et al 2004;Virgo et al 2005). The predicted spectra, such as those given in Figures 1-3, were obtained by co-adding the individual spectral features obtained using a rotational temperature of 10 K and a Lorentzian linewidth of 30 MHz full width at half maximum.…”

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confidence: 99%

“…The supersonic molecular beam production and laser-induced fluorescence optical detection schemes were similar to those used previous for optical Zeeman studies of TiO (Virgo et al 2005) and CaH (Chen et al 2006). A cold (rotational temperature T rot ∼ = 15 K) sample of MgH was generated by laser ablating a solid magnesium rod in the presence of a pulsed supersonic expansion of a (50%)He/(50%)H 2 gas mixture.…”

Section: Methodsmentioning

confidence: 99%

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OPTICAL ZEEMAN SPECTROSCOPY OF THE (0, 0)A²Π-X²Σ⁺BAND SYSTEM OF MAGNESIUM HYDRIDE

Zhang

Steimle

2014

ApJ

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The Zeeman effect on lines in the (0, 0) A 2 Π-X 2 Σ + band system of a cold molecular beam sample of magnesium hydride, MgH, has been recorded at high resolution (FWHM ∼ =60 MHz) and analyzed. The lines associated with the lowest rotational levels are detected for the first time. The field-free spectrum was analyzed to produce spectroscopic parameters for the A 2 Π (v = 0) state. The experimentally observed magnetic tuning of the low-rotational spectral features at field strengths comparable to those found in sunspots is accurately modeled by assuming that the electronic spin and orbital magnetic g-factors, g S and g L , of the A 2 Π and X 2 Σ + states are 2.002 and 1.000, respectively, and g l is −0.0023 for the X 2 Σ + .

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“…28 The field was calibrated using a commercial Gauss meter. A polarization rotator was used to align the electric field vector of the linearly polarized laser radiation either perpendicular (ΔM J = ± 1) or parallel (ΔM J = 0) to the static magnetic field vector.…”

Section: Methodsmentioning

confidence: 99%

Molecular-Beam Optical Stark and Zeeman Study of the [17.8]0⁺–X¹Σ⁺ (0,0) Band System of AuF

et al. 2013

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The [17.8]0(+)-X(1)Σ(+) (0,0) band of gold monofluoride, AuF, has been recorded at a resolution of 40 MHz both field free and in the presence of a static electric and magnetic field. The observed Stark shifts were analyzed to determine the permanent electric dipole moment, μel, of 2.03 ± 0.05 D and 4.13 ± 0.02 D, for the [17.8]0(+)(v = 0) and X(1)Σ(+)(v = 0) states, respectively. The small magnetic tuning observed for the [17.8]0(+)(v = 0) state is attributed to rotational and magnetic field mixing with the [17.7]1 state and has been successfully modeled using an effective Hamiltonian for the (3)Π state. A comparison with the numerous published theoretical predictions is made.

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Optical Zeeman Spectroscopy of the (0, 0) Bands of theB³Π–X³Δ andA³Φ–X³Δ Transitions of Titanium Monoxide, TiO

Cited by 18 publications

References 32 publications

Magneto-optical Trap for Polar Molecules

Magneto-optical Trap for Polar Molecules

OPTICAL ZEEMAN SPECTROSCOPY OF THE (0, 0)A²Π-X²Σ⁺BAND SYSTEM OF MAGNESIUM HYDRIDE

Molecular-Beam Optical Stark and Zeeman Study of the [17.8]0⁺–X¹Σ⁺ (0,0) Band System of AuF

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Optical Zeeman Spectroscopy of the (0, 0) Bands of theB3Π–X3Δ andA3Φ–X3Δ Transitions of Titanium Monoxide, TiO

Cited by 18 publications

References 32 publications

Magneto-optical Trap for Polar Molecules

Magneto-optical Trap for Polar Molecules

OPTICAL ZEEMAN SPECTROSCOPY OF THE (0, 0)A2Π-X2Σ+BAND SYSTEM OF MAGNESIUM HYDRIDE

Molecular-Beam Optical Stark and Zeeman Study of the [17.8]0+–X1Σ+ (0,0) Band System of AuF

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Optical Zeeman Spectroscopy of the (0, 0) Bands of theB³Π–X³Δ andA³Φ–X³Δ Transitions of Titanium Monoxide, TiO

OPTICAL ZEEMAN SPECTROSCOPY OF THE (0, 0)A²Π-X²Σ⁺BAND SYSTEM OF MAGNESIUM HYDRIDE

Molecular-Beam Optical Stark and Zeeman Study of the [17.8]0⁺–X¹Σ⁺ (0,0) Band System of AuF