Imperial College London

DrMichaelTarbutt

Faculty of Natural SciencesDepartment of Physics

Reader in Quantum Optics
 
 
 
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Contact

 

+44 (0)20 7594 7741m.tarbutt

 
 
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Location

 

207Blackett LaboratorySouth Kensington Campus

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Summary

 

Publications

Publication Type
Year
to

78 results found

Asselin P, Berger Y, Huet TR, Margules L, Motiyenko R, Hendricks RJ, Tarbutt MR, Tokunaga SK, Darquie Bet al., 2017, Characterising molecules for fundamental physics: an accurate spectroscopic model of methyltrioxorhenium derived from new infrared and millimetre-wave measurements, PHYSICAL CHEMISTRY CHEMICAL PHYSICS, Vol: 19, Pages: 4576-4587, ISSN: 1463-9076

JOURNAL ARTICLE

Asselin P, Berger Y, Huet TR, Margulès L, Motiyenko R, Hendricks RJ, Tarbutt M, Tokunaga SK, Darquie Bet al., 2017, Characterising molecules for fundamental physics: an accurate spectroscopic model of methyltrioxorhenium derived from new infrared and millimetre-wave measurements, Physical Chemistry Chemical Physics, Vol: 19, Pages: 4576-4587, ISSN: 1463-9084

Precise spectroscopic analysis of polyatomic molecules enables many striking advances in physical chemistry and fundamental physics. We use several new high-resolution spectroscopic devices to improve our understanding of the rotational and rovibrational structure of methyltrioxorhenium (MTO), the achiral parent of a family of large oxorhenium compounds that are ideal candidate species for a planned measurement of parity violation in chiral molecules. Using millimetre-wave and infrared spectroscopy in a pulsed supersonic jet, a cryogenic buffer gas cell, and room temperature absorption cells, we probe the ground state and the Re[double bond, length as m-dash]O antisymmetric and symmetric stretching excited states of both CH3187ReO3 and CH3185ReO3 isotopologues in the gas phase with unprecedented precision. By extending the rotational spectra to the 150–300 GHz range, we characterize the ground state rotational and hyperfine structure up to J = 43 and K = 41, resulting in refinements to the rotational, quartic and hyperfine parameters, and the determination of sextic parameters and a centrifugal distortion correction to the quadrupolar hyperfine constant. We obtain rovibrational data for temperatures between 6 and 300 K in the 970–1015 cm−1 range, at resolutions down to 8 MHz and accuracies of 30 MHz. We use these data to determine more precise excited-state rotational, Coriolis and quartic parameters, as well as the ground-state centrifugal distortion parameter DK of the 187Re isotopologue. We also account for hyperfine structure in the rovibrational transitions and hence determine the upper state rhenium atom quadrupole coupling constant eQq′.

JOURNAL ARTICLE

Lim J, Almond JR, Tarbutt MR, Duc TN, Steimle TCet al., 2017, The [557]-X-2 Sigma(+) and [561]-X-2 Sigma(+) bands of ytterbium fluoride, (YbF)-Yb-174, JOURNAL OF MOLECULAR SPECTROSCOPY, Vol: 338, Pages: 81-90, ISSN: 0022-2852

JOURNAL ARTICLE

Tokunaga SK, Hendricks RJ, Tarbutt MR, Darquie Bet al., 2017, High-resolution mid-infrared spectroscopy of buffer-gas-cooled methyltrioxorhenium molecules, NEW JOURNAL OF PHYSICS, Vol: 19, ISSN: 1367-2630

JOURNAL ARTICLE

Truppe S, Hambach M, Skoff SM, Bulleid NE, Bumby JS, Hendricks RJ, Hinds EA, Sauer BE, Tarbutt MRet al., 2017, A buffer gas beam source for short, intense and slow molecular pulses, Journal of Modern Optics, Pages: 1-9, ISSN: 0950-0340

JOURNAL ARTICLE

Truppe S, Williams H, Fitch N, Hambach M, Wall T, Hinds E, Sauer B, Tarbutt Met al., 2017, An intense, cold, velocity-controlled molecular beam by frequency-chirpedlaser slowing, New Journal of Physics, Vol: 19, ISSN: 1367-2630

Using frequency-chirped radiation pressure slowing, we precisely controlthe velocity of a pulsed CaF molecular beam down to a few m/s, compressing its velocity spread by a factor of 10 while retaining high intensity: at a velocity of 15 m/s the flux, measured 1.3 m from the source, is 7×10⁵ molecules per cm² per shot in a single rovibrational state. The beam is suitable for loading a magneto-optical trap or, when combined with transverse laser cooling, improving the precision of spectroscopicmeasurements that test fundamental physics. We compare the frequency-chirped slowing method with the more commonly used frequency-broadened slowing method.

JOURNAL ARTICLE

Truppe S, Williams HJ, Fitch NJ, Hambach M, Wall TE, Hinds EA, Sauer BE, Tarbutt MRet al., 2017, An intense, cold, velocity-controlled molecular beam by frequency-chirped laser slowing, NEW JOURNAL OF PHYSICS, Vol: 19, ISSN: 1367-2630

JOURNAL ARTICLE

Truppe S, Williams HJ, Hambach M, Caldwell L, Fitch NJ, Hinds EA, Sauer BE, Tarbutt MRet al., 2017, Molecules cooled below the Doppler limit, Nature Physics, ISSN: 1745-2473

The ability to cool atoms below the Doppler limit -- the minimum temperaturereachable by Doppler cooling -- has been essential to most experiments withquantum degenerate gases, optical lattices and atomic fountains, among manyother applications. A broad set of new applications await ultracold molecules,and the extension of laser cooling to molecules has begun. A molecularmagneto-optical trap has been demonstrated, where molecules approached theDoppler limit. However, the sub-Doppler temperatures required for mostapplications have not yet been reached. Here we cool molecules to 50 uK, wellbelow the Doppler limit, using a three-dimensional optical molasses. Theseultracold molecules could be loaded into optical tweezers to trap arbitraryarrays for quantum simulation, launched into a molecular fountain for testingfundamental physics, and used to study ultracold collisions and ultracoldchemistry.

JOURNAL ARTICLE

Williams H, Truppe S, Hambach M, Caldwell L, Fitch N, Hinds EA, Sauer BE, Tarbutt MRet al., 2017, Characteristics of a magneto-optical trap of molecules, New Journal of Physics

JOURNAL ARTICLE

Devlin JA, Tarbutt MR, 2016, Three-dimensional Doppler, polarization-gradient, and magneto-optical forces for atoms and molecules with dark states, NEW JOURNAL OF PHYSICS, Vol: 18, ISSN: 1367-2630

JOURNAL ARTICLE

Fitch NJ, Tarbutt MR, 2016, Principles and Design of a Zeeman-Sisyphus Decelerator for Molecular Beams, CHEMPHYSCHEM, Vol: 17, Pages: 3609-3623, ISSN: 1439-4235

JOURNAL ARTICLE

Fitch NJ, Tarbutt MR, 2016, Inside Cover: Principles and Design of a Zeeman-Sisyphus Decelerator for Molecular Beams (ChemPhysChem 22/2016), ChemPhysChem, Vol: 17, Pages: 3579-3579, ISSN: 1439-4235

JOURNAL ARTICLE

Guttridge A, Hopkins SA, Kemp SL, Boddy D, Freytag R, Jones MPA, Tarbutt MR, Hinds EA, Cornish SLet al., 2016, Direct loading of a large Yb MOT on the S-1(0) -> P-3(1) transition, JOURNAL OF PHYSICS B-ATOMIC MOLECULAR AND OPTICAL PHYSICS, Vol: 49, ISSN: 0953-4075

JOURNAL ARTICLE

Hopkins SA, Butler K, Guttridge A, Kemp S, Freytag R, Hinds EA, Tarbutt MR, Cornish SLet al., 2016, A versatile dual-species Zeeman slower for caesium and ytterbium, REVIEW OF SCIENTIFIC INSTRUMENTS, Vol: 87, ISSN: 0034-6748

JOURNAL ARTICLE

Hopkins SA, Butler K, Guttridge A, Kemp S, Freytag R, Hinds EA, Tarbutt MR, Cornish SLet al., 2016, A versatile dual-species Zeeman slower for caesium and ytterbium (vol 87, 043109, 2016), REVIEW OF SCIENTIFIC INSTRUMENTS, Vol: 87, ISSN: 0034-6748

JOURNAL ARTICLE

Kemp SL, Butler KL, Freytag R, Hopkins SA, Hinds EA, Tarbutt MR, Cornish SLet al., 2016, Production and characterization of a dual species magneto-optical trap of cesium and ytterbium, REVIEW OF SCIENTIFIC INSTRUMENTS, Vol: 87, ISSN: 0034-6748

JOURNAL ARTICLE

Norrgard EB, McCarron DJ, Steinecker MH, Tarbutt MR, DeMille Det al., 2016, Submillikelvin Dipolar Molecules in a Radio-Frequency Magneto-Optical Trap, PHYSICAL REVIEW LETTERS, Vol: 116, ISSN: 0031-9007

JOURNAL ARTICLE

Devlin J, Tarbutt MR, Kokkin DL, Steimle TCet al., 2015, Measurements of the Zeeman effect in the A(2)Pi and B-2 Sigma(+) states of calcium fluoride, JOURNAL OF MOLECULAR SPECTROSCOPY, Vol: 317, Pages: 1-9, ISSN: 0022-2852

JOURNAL ARTICLE

Dunseith DP, Truppe S, Hendricks RJ, Sauer BE, Hinds EA, Tarbutt MRet al., 2015, A high quality, efficiently coupled microwave cavity for trapping cold molecules, JOURNAL OF PHYSICS B-ATOMIC MOLECULAR AND OPTICAL PHYSICS, Vol: 48, ISSN: 0953-4075

JOURNAL ARTICLE

Lim J, Frye MD, Hutson JM, Tarbutt MRet al., 2015, Modeling sympathetic cooling of molecules by ultracold atoms, PHYSICAL REVIEW A, Vol: 92, ISSN: 2469-9926

JOURNAL ARTICLE

Tarbutt MR, 2015, Magneto-optical trapping forces for atoms and molecules with complex level structures, NEW JOURNAL OF PHYSICS, Vol: 17, ISSN: 1367-2630

JOURNAL ARTICLE

Tarbutt MR, Steimle TC, 2015, Modeling magneto-optical trapping of CaF molecules, PHYSICAL REVIEW A, Vol: 92, ISSN: 1050-2947

JOURNAL ARTICLE

Hendricks RJ, Holland DA, Truppe S, Sauer BE, Tarbutt MRet al., 2014, Vibrational branching ratios and hyperfine structure of <sup>11</sup>BH and its suitability for laser cooling, Frontiers of Physics, Vol: 2, Pages: 1-8, ISSN: 2095-0462

© 2014 Hendricks, Holland, Truppe, Sauer and Tarbutt. The simple structure of the BH molecule makes it an excellent candidate for direct laser cooling. We measure the branching ratios for the decay of the A 1 Π (v ′ = 0) state to vibrational levels of the ground state, X 1 Σ + , and find that they are exceedingly favorable for laser cooling. We verify that the branching ratio for the spin-forbidden transition to the intermediate a 3 Π state is inconsequentially small. We measure the frequency of the lowest rotational transition of the X state, and the hyperfine structure in the relevant levels of both the X and A states, and determine the nuclear electric quadrupole and magnetic dipole coupling constants. Our results show that, with a relatively simple laser cooling scheme, a Zeeman slower and magneto-optical trap can be used to cool, slow and trap BH molecules.

JOURNAL ARTICLE

Hudson JJ, Tarbutt MR, Sauer BE, Hinds EAet al., 2014, Stochastic multi-channel lock-in detection, NEW JOURNAL OF PHYSICS, Vol: 16, ISSN: 1367-2630

JOURNAL ARTICLE

Smallman IJ, Wang F, Steimle TC, Tarbutt MR, Hinds EAet al., 2014, Radiative branching ratios for excited states of (YbF)-Yb-174: Application to laser cooling, JOURNAL OF MOLECULAR SPECTROSCOPY, Vol: 300, Pages: 3-6, ISSN: 0022-2852

JOURNAL ARTICLE

Truppe S, Hendricks RJ, Hinds EA, Tarbutt MRet al., 2014, MEASUREMENT OF THE LOWEST MILLIMETER-WAVE TRANSITION FREQUENCY OF THE CH RADICAL, ASTROPHYSICAL JOURNAL, Vol: 780, ISSN: 0004-637X

JOURNAL ARTICLE

Truppe S, Hendricks RJ, Tokunaga SK, Hinds EA, Tarbutt MRet al., 2014, Microwave spectroscopy of A-doublet transitions in the ground state of CH, JOURNAL OF MOLECULAR SPECTROSCOPY, Vol: 300, Pages: 70-78, ISSN: 0022-2852

JOURNAL ARTICLE

Zhelyazkova V, Cournol A, Wall TE, Matsushima A, Hudson JJ, Hinds EA, Tarbutt MR, Sauer BEet al., 2014, Laser cooling and slowing of CaF molecules, PHYSICAL REVIEW A, Vol: 89, ISSN: 1050-2947

JOURNAL ARTICLE

Bulleid NE, Skoff SM, Hendricks RJ, Sauer BE, Hinds EA, Tarbutt MRet al., 2013, Characterization of a cryogenic beam source for atoms and molecules, PHYSICAL CHEMISTRY CHEMICAL PHYSICS, Vol: 15, Pages: 12299-12307, ISSN: 1463-9076

JOURNAL ARTICLE

Sauer BE, Devlin JA, Hudson JJ, Kara DM, Smallman IJ, Tarbutt MR, Hinds EAet al., 2013, Time reversal symmetry violation in the YbF molecule, HYPERFINE INTERACTIONS, Vol: 214, Pages: 119-126, ISSN: 0304-3843

JOURNAL ARTICLE

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