Imperial College London

DrNoahFitch

Faculty of Natural SciencesDepartment of Physics

Research Associate
 
 
 
//

Contact

 

+44 (0)20 7594 7864n.fitch Website CV

 
 
//

Location

 

737Blackett LaboratorySouth Kensington Campus

//

Summary

 

Publications

Publication Type
Year
to

12 results found

Williams H, Truppe S, Hambach M, Caldwell L, Fitch N, Hinds E, Sauer B, Tarbutt Met al., Characteristics of a magneto-optical trap of molecules, New Journal of Physics, ISSN: 1367-2630

We present the properties of a magneto-optical trap (MOT) of CaFmolecules. We study the process of loading the MOT from a decelerated bu er-gas-cooled beam, and how best to slow this molecular beam in order to capture the most molecules. We determine how the number of molecules, the photon scattering rate, the oscillation frequency, damping constant, temperature, cloud size and lifetime depend on the key parameters of the MOT, especially the intensity and detuning of the main cooling laser. We compare our results to analytical and numerical models, to the properties of standard atomic MOTs, and to MOTs of SrF molecules. We load up to 2 x 10⁴ molecules, and measure a maximum scattering rate of 2.5 x 10⁶ s⁻¹ per molecule, a maximum oscillation frequency of 100 Hz, a maximum damping constant of 500 s⁻¹, and a minimum MOT rms radius of 1.5 mm. A minimum temperature of 730 μK is obtained by ramping down the laser intensity to low values. The lifetime, typically about 100 ms, is consistent with a leak out of the cooling cycle with a branching ratio of about 6 x 10⁻⁶. The MOT has a capture velocity of about 11 m/s.

JOURNAL ARTICLE

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

JOURNAL ARTICLE

Fitch NJ, 2017, What Goes Up Must Come Down, Physics, Vol: 9

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

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

Fabrikant MI, Li T, Fitch NJ, Farrow N, Weinstein JD, Lewandowski HJet al., 2014, Method for traveling-wave deceleration of buffer-gas beams of CH, PHYSICAL REVIEW A, Vol: 90, ISSN: 1050-2947

JOURNAL ARTICLE

Fitch NJ, Esteves DA, Fabrikant MI, Briles TC, Shyur Y, Parazzoli LP, Lewandowski HJet al., 2012, State purity of decelerated molecular beams, JOURNAL OF MOLECULAR SPECTROSCOPY, Vol: 278, Pages: 1-6, ISSN: 0022-2852

JOURNAL ARTICLE

Parazzoli LP, Fitch NJ, Zuchowski PS, Hutson JM, Lewandowski HJet al., 2011, Large Effects of Electric Fields on Atom-Molecule Collisions at Millikelvin Temperatures, PHYSICAL REVIEW LETTERS, Vol: 106, ISSN: 0031-9007

JOURNAL ARTICLE

Fitch NJ, Weidner CA, Parazzoli LP, Dullin HR, Lewandowski HJet al., 2009, Experimental Demonstration of Classical Hamiltonian Monodromy in the 1:1:2 Resonant Elastic Pendulum, PHYSICAL REVIEW LETTERS, Vol: 103, ISSN: 0031-9007

JOURNAL ARTICLE

Parazzoli LP, Fitch N, Lobser DS, Lewandowski HJet al., 2009, High-energy-resolution molecular beams for cold collision studies, NEW JOURNAL OF PHYSICS, Vol: 11, ISSN: 1367-2630

JOURNAL ARTICLE

Fitch N, Bliven W, Mitchell T, 2007, Automating data acquisition for the Cavendish balance to improve the measurement of G, AMERICAN JOURNAL OF PHYSICS, Vol: 75, Pages: 309-312, ISSN: 0002-9505

JOURNAL ARTICLE

This data is extracted from the Web of Science and reproduced under a licence from Thomson Reuters. You may not copy or re-distribute this data in whole or in part without the written consent of the Science business of Thomson Reuters.

Request URL: http://wlsprd.imperial.ac.uk:80/respub/WEB-INF/jsp/search-html.jsp Request URI: /respub/WEB-INF/jsp/search-html.jsp Query String: respub-action=search.html&id=00818848&limit=30&person=true