| Hertz-level measurement of the optical clock frequency in a single 88Sr+ ion HS Margolis, GP Barwood, G Huang, HA Klein, SN Lea, K Szymaniec, ... Science 306 (5700), 1355-1358, 2004 | 459 | 2004 |
| Observation of an electric octupole transition in a single ion M Roberts, P Taylor, GP Barwood, P Gill, HA Klein, WRC Rowley Physical review letters 78 (10), 1876, 1997 | 192 | 1997 |
| Quantum physics exploring gravity in the outer solar system: the SAGAS project P Wolf, CJ Bordé, A Clairon, L Duchayne, A Landragin, P Lemonde, ... Experimental Astronomy 23, 651-687, 2009 | 160 | 2009 |
| Einstein Gravity Explorer–a medium-class fundamental physics mission S Schiller, GM Tino, P Gill, C Salomon, U Sterr, E Peik, A Nevsky, A Görlitz, ... Experimental astronomy 23, 573-610, 2009 | 136 | 2009 |
| Measurement of the Electric Quadrupole Moment of the Level in GP Barwood, HS Margolis, G Huang, P Gill, HA Klein Physical review letters 93 (13), 133001, 2004 | 112 | 2004 |
| Agreement between two optical clocks to 4 parts in 10 GP Barwood, G Huang, HA Klein, LAM Johnson, SA King, HS Margolis, ... Physical Review A 89 (5), 050501, 2014 | 110 | 2014 |
| Absolute frequency measurement of the 674-nm clock transition using a femtosecond optical frequency comb HS Margolis, G Huang, GP Barwood, SN Lea, HA Klein, WRC Rowley, ... Physical Review A 67 (3), 032501, 2003 | 108 | 2003 |
| Laser cooling of trapped ytterbium ions using a four-level optical-excitation scheme AS Bell, P Gill, HA Klein, AP Levick, C Tamm, D Schnier Physical Review A 44 (1), R20, 1991 | 83 | 1991 |
| Analysis of thermal radiation in ion traps for optical frequency standards M Doležal, P Balling, PBR Nisbet-Jones, SA King, JM Jones, HA Klein, ... Metrologia 52 (6), 842, 2015 | 73 | 2015 |
| Trapped ion optical frequency standards P Gill, GP Barwood, HA Klein, G Huang, SA Webster, PJ Blythe, K Hosaka, ... Measurement Science and Technology 14 (8), 1174, 2003 | 69 | 2003 |
| Laser cooling of trapped Yb+ HA Klein, AS Bell, GP Barwood, P Gill Applied Physics B 50, 13-17, 1990 | 64 | 1990 |
| Observation of the 5s2S1/2−4d2D5/2 transition in a single laser-cooled trapped Sr+ ion by using an all-solid-state system of lasers GP Barwood, CS Edwards, P Gill, HA Klein, WRC Rowley Optics letters 18 (9), 732-734, 1993 | 56 | 1993 |
| Laser-Induced Resonance Spectroscopy of the Fine Structure of EG Myers, P Kuske, HJ Andrä, IA Armour, NA Jelley, HA Klein, JD Silver, ... Physical Review Letters 47 (2), 87, 1981 | 51 | 1981 |
| Optical clocks in space S Schiller, A Görlitz, A Nevsky, JCJ Koelemeij, A Wicht, P Gill, HA Klein, ... Nuclear Physics B-Proceedings Supplements 166, 300-302, 2007 | 47 | 2007 |
| Development of optical frequency standards based upon the/sup 2/S/sub 1/2/-/sup 2/D/sub 5/2/transition in/sup 88/Sr/sup+/and/sup 87/Sr/sup+ G Barwood, K Gao, P Gill, G Huang, HA Klein IEEE Transactions on Instrumentation and Measurement 50 (2), 543-547, 2001 | 47 | 2001 |
| Subkilohertz comparison of the single-ion optical-clock transition in two traps GP Barwood, G Huang, HA Klein, P Gill, RBM Clarke Physical Review A 59 (5), R3178, 1999 | 46 | 1999 |
| Astrodynamical Space Test of Relativity using Optical Devices I (ASTROD I)—a class-M fundamental physics mission proposal for Cosmic Vision 2015–2025 T Appourchaux, R Burston, Y Chen, M Cruise, H Dittus, B Foulon, P Gill, ... Experimental Astronomy 23, 491-527, 2009 | 44 | 2009 |
| Observation of the hyperfine structure of the transition in GP Barwood, K Gao, P Gill, G Huang, HA Klein Physical Review A 67 (1), 013402, 2003 | 44 | 2003 |
| Sub-kHz “clock” transition linewidths in a cold trapped 88Sr+ ion in low magnetic fields using 1092-nm polarisation switching GP Barwood, P Gill, G Huang, HA Klein, WRC Rowley Optics communications 151 (1-3), 50-55, 1998 | 42 | 1998 |
| Matter wave explorer of gravity (MWXG) W Ertmer, C Schubert, T Wendrich, M Gilowski, M Zaiser, T Zoest, E Rasel, ... Experimental Astronomy 23, 611-649, 2009 | 39 | 2009 |
