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  • Journal article
    KIM MS, KNIGHT PL, 1987,

    QUANTUM-JUMP TELEGRAPH NOISE AND MACROSCOPIC INTENSITY FLUCTUATIONS

    , PHYSICAL REVIEW A, Vol: 36, Pages: 5265-5270, ISSN: 1050-2947
  • Journal article
    Gill P, Thompson RC, 1987,

    The preparation and analysis of iodine cells

    , Metrologia, Vol: 23, Pages: 161-166, ISSN: 0026-1394

    The procedure used at NPL for the routine filling of iodine cells is described, along with standard methods employed for the verification of the cells. Results show that a small proportion of the cells filled have significant contamination present. Detailed spectral analysis of these cells identifies the contaminants as primarily N2 and CO. It is also shown that contaminated cells can be temporarily improved by an extended period of radio-frequency discharge.
  • Journal article
    Hinds EA, Alhassid Y, Meschede D, 1987,

    Dynamical Symmetries of the Perturbed Hydrogen Atom: The van der Waals Interaction

    , Physical Review Letters, ISSN: 0031-9007
  • Journal article
    DEOLIVEIRA FAM, DALTON BJ, KNIGHT PL, 1987,

    SQUEEZING AND TRAPPING IN 3-LEVEL ATOMS

    , JOURNAL OF THE OPTICAL SOCIETY OF AMERICA B-OPTICAL PHYSICS, Vol: 4, Pages: 1558-1564, ISSN: 0740-3224
  • Journal article
    CODLING K, FRASINSKI LJ, HATHERLY P, BARR JRMet al., 1987,

    ON THE MAJOR-MODE OF MULTIPHOTON MULTIPLE IONIZATION

    , JOURNAL OF PHYSICS B-ATOMIC MOLECULAR AND OPTICAL PHYSICS, Vol: 20, Pages: L525-L531, ISSN: 0953-4075
  • Journal article
    KIM MS, KNIGHT PL, WODKIEWICZ K, 1987,

    CORRELATIONS BETWEEN SUCCESSIVELY EMITTED PHOTONS IN RESONANCE FLUORESCENCE

    , OPTICS COMMUNICATIONS, Vol: 62, Pages: 385-388, ISSN: 0030-4018
  • Journal article
    FRASINSKI LJ, CODLING K, HATHERLY P, BARR J, ROSS IN, TONER WTet al., 1987,

    FEMTOSECOND DYNAMICS OF MULTIELECTRON DISSOCIATIVE IONIZATION BY USE OF PICOSECOND LASER

    , PHYSICAL REVIEW LETTERS, Vol: 58, Pages: 2424-2427, ISSN: 0031-9007
  • Journal article
    LOUDON R, KNIGHT PL, 1987,

    SQUEEZED LIGHT

    , JOURNAL OF MODERN OPTICS, Vol: 34, Pages: 709-759, ISSN: 0950-0340
  • Journal article
    BARNETT SM, KNIGHT PL, 1987,

    SQUEEZING IN CORRELATED QUANTUM-SYSTEMS

    , JOURNAL OF MODERN OPTICS, Vol: 34, Pages: 841-853, ISSN: 0950-0340
  • Journal article
    GOMES ASL, GOUVEIANETO AS, FRENCH PMW, AVRAMOPOULOS H, NEW GHC, TAYLOR JRet al., 1987,

    OPTICAL PULSE-COMPRESSION OF RAMAN-DEPLETED PICOSECOND PULSES AND SPECTRALLY WINDOWED SELF-PHASE MODULATED PULSES AT 1.06-MU-M

    , IEE PROCEEDINGS-J OPTOELECTRONICS, Vol: 134, Pages: 171-179, ISSN: 0267-3932
  • Journal article
    RADMORE PM, TARZI S, KNIGHT PL, 1987,

    RATES AND RECURRENCES IN QUASI-CONTINUUM PHOTOEXCITATION

    , JOURNAL OF MODERN OPTICS, Vol: 34, Pages: 587-606, ISSN: 0950-0340
  • Journal article
    WODKIEWICZ K, KNIGHT PL, BUCKLE SJ, BARNETT SMet al., 1987,

    SQUEEZING AND SUPERPOSITION STATES

    , PHYSICAL REVIEW A, Vol: 35, Pages: 2567-2577, ISSN: 1050-2947
  • Journal article
    REMPE G, WALTHER H, KLEIN N, 1987,

    OBSERVATION OF QUANTUM COLLAPSE AND REVIVAL IN A ONE-ATOM MASER

    , PHYSICAL REVIEW LETTERS, Vol: 58, Pages: 353-356, ISSN: 0031-9007
  • Journal article
    Boshier MG, Baird PEG, Foot CJ, Hinds EA, Plimmer MD, Stacey DN, Swan JB, Tate DA, Warrington DM, Woodgate GKet al., 1987,

    Precision spectroscopy of hydrogen and deuterium

    , Nature, Vol: 330, Pages: 463-465, ISSN: 0028-0836

    The hydrogen atom is an important testing ground for fundamental physical theory, because it is the simplest stable atomic system and its properties can be calculated to enormous precision. Measurements on hydrogen played a major role in the development of quantum electrodynamics (QED), a theory of electromagnetic interactions which includes quantization of the radiation field1,2. Tests of QED in hydrogen involve precision measurements of transition frequencies; the transition generally studied is between two excited states (2s2S1/2 and 2p2P1/2). Much higher precision is possible if a transition involving the ground state is studied, but this potential has not so far been exploited because of experimental difficulties. We have now carried out an experiment of this type which has given preliminary results and opens new possibilities for precision tests of QED in the future. © 1987 Nature Publishing Group.
  • Conference paper
    Anderson A, Haroche S, Hinds EA, Jhe W, Meschede D, Moi Let al., 1987,

    ATOMIC PHYSICS EXPERIMENTS IN MICRON-SIZED CAVITIES: SUPPRESSING SPONTANEOUS DECAY AT OPTICAL FREQUENCY.

    Spontaneous emission from an excited atomic state reflects the properties of the surrounding vacuum field. By placing the atom near a metallic surface or in a cavity, one can modify the spectral density of the vacuum modes coupled to it and either enhance or inhibit spontaneous emission. The spontaneous emission from substates of the 5D//5/////2 level of cesium at 3. 49 mu m has been suppressed by passing the atom between two gold mirrors separated by a 1. 1- mu m gap. The atoms travel in the gap for about 13 natural lifetimes without radiating. Substates with maximum angular momentum normal to the mirrors have their emission turned off. Other substates have their radiation rate either decreased or increased by a factor of between 0. 4 and 1. 3. A magnetic field making an angle with the direction normal to the mirrors was used to study the dependence of the spontaneous emission rates on the polarization of the excited atoms in the gap, enabling the anisotropy of the vacuum-field fluctuations between the two closely spaced mirrors to be checked. The deflection of cesium Rydberg atoms attracted to a metallic surface by the dipole image van der Waals force was also observed.
  • Journal article
    Jhe W, Anderson A, Hinds EA, Meschede D, Moi L, Haroche Set al., 1987,

    Suppression of spontaneous decay at optical frequencies: Test of vacuum-field anisotropy in confined space

    , Physical Review Letters, Vol: 58, Pages: 666-669, ISSN: 0031-9007

    The radiative decay of Cs atoms excited into the 5D5/2 level and passing between two metallic mirrors spaced by a 1.1-m gap is observed to depend upon their angular momentum. Spontaneous emission at a wavelength of 3.49 m is suppressed for the substates with maximum angular momentum normal to the mirrors, which survive without substantial decay during 13 natural lifetimes. The radiation rate is modified by application of a magnetic field which mixes sublevels having lifetimes in the gap. This experiment illustrates the anisotropy of the vacuum field in confined space. © 1987 The American Physical Society.
  • Conference paper
    Schropp D, Cho D, Vold T, Hinds EAet al., 1987,

    NEW EXPERIMENTAL LIMITS ON P AND T VIOLATION.

    , Pages: 16-17

    The first results are announced from a molecular beam experiment on the polar molecule TIF, searching for a P and T violating interaction of the general form H//e//f//f equals d sigma multiplied by lambda , where sigma is a unit angular momentum, lambda is a unit polar vector, and d characterizes the strength of the interaction. In this case sigma and lambda lie along the TI nuclear spin direction and the internuclear axis, respectively. An external electric field E is applied along the sigma direction to polarize the molecule so that sigma multiplied by lambda does not equal 0. So far, the experiment has yielded a null result with substantially smaller uncertainty than any previous work. Interpretation of the limit on d leads to limits on the possible values of the proton electric dipole moment the thallium nuclear electric dipole moment, and the weak electron-nucleon tensor coupling C// tau .
  • Journal article
    Schropp D, Cho D, Vold T, Hinds EAet al., 1987,

    New limits on time-reversal invariance from the hyperfine structure of thallium fluoride

    , Physical Review Letters, Vol: 59, Pages: 991-994, ISSN: 0031-9007

    We have made a very precise test of time-reversal invariance using nuclear-spin resonance in a thallium fluoride molecular beam. We searched for a shift of the 120-kHz Tl resonance when an external electric field was reversed relative to the nuclear spin and found it to be (-2.2±2.1)×10-3 Hz, less than 0.02 ppm and a fivefold improvement over any previous measurement. Our result imposes new constraints on the proton electric dipole moment and on CP nonconservation in strong and weak interactions. © 1987 The American Physical Society.
  • Journal article
    FRASINSKI LJ, STANKIEWICZ M, RANDALL KJ, HATHERLY PA, CODLING Ket al., 1986,

    Dissociative photoionisation of molecules probed by triple coincidence; double time-of-flight techniques

    , Journal of Physics B - Atomic Molecular and Optical Physics, Vol: 19, Pages: L819-L824, ISSN: 0953-4075

    Two novel experiments producing three-dimensional histograms of time-of-flight correlations have recently been performed at the Daresbury Synchrotron Radiation Source. In the first, the two photoions from the double ionisation of SF, were detected; in the second, the photoelectron and the O+ ion from the predissociation of 0:. This technique allows a visual insight into the details of dissociative photoionisation which has not beenavailable previously.
  • Journal article
    PATEL ZG, NAIK AG, PATEL CL, PATEL RB, PATEL IGet al., 1986,

    EFFECT OF TIME OF NITROGEN APPLICATION ON THE YIELD OF LOW LAND PADDY UNDER SOUTH GUJARAT CONDITIONS

    , INDIAN JOURNAL OF AGRONOMY, Vol: 31, Pages: 396-397, ISSN: 0537-197X
  • Journal article
    PATEL CL, PATEL ZG, PATEL RB, NAIK AGet al., 1986,

    CHEMICAL WEED-CONTROL IN ONION BULB CROP

    , INDIAN JOURNAL OF AGRONOMY, Vol: 31, Pages: 414-415, ISSN: 0537-197X
  • Journal article
    GOMES ASL, GOUVEIANETO AS, TAYLOR JR, AVRAMOPOULOS H, NEW GHCet al., 1986,

    OPTICAL PULSE NARROWING BY THE SPECTRAL WINDOWING OF SELF-PHASE MODULATED PICOSECOND PULSES

    , OPTICS COMMUNICATIONS, Vol: 59, Pages: 399-404, ISSN: 0030-4018
  • Journal article
    LAUDER MA, KNIGHT PL, GREENLAND PT, 1986,

    PULSE-SHAPE EFFECTS IN INTENSE-FIELD LASER EXCITATION OF ATOMS

    , OPTICA ACTA, Vol: 33, Pages: 1231-1252, ISSN: 0030-3909
  • Journal article
    LOVE DJ, NEW GHC, LAUDER MA, 1986,

    BEAM PROPAGATION ANALYSIS OF A NONLINEAR DUAL-CHANNEL DIRECTIONAL COUPLER

    , OPTICS COMMUNICATIONS, Vol: 59, Pages: 177-182, ISSN: 0030-4018
  • Journal article
    PATEL MP, DUNGARANI RA, PATEL HC, PATEL RG, PATEL RBet al., 1986,

    RESPONSE OF GROUNDNUT CULTIVARS TO DIFFERENT DATES OF SOWING UNDER RAIN-FED CONDITIONS

    , INDIAN JOURNAL OF AGRONOMY, Vol: 31, Pages: 285-288, ISSN: 0537-197X
  • Journal article
    CATHERALL JM, NEW GHC, 1986,

    ROLE OF SPONTANEOUS EMISSION IN THE DYNAMICS OF MODE-LOCKING BY SYNCHRONOUS PUMPING

    , IEEE JOURNAL OF QUANTUM ELECTRONICS, Vol: 22, Pages: 1593-1599, ISSN: 0018-9197
  • Journal article
    BUCKLE SJ, BARNETT SM, KNIGHT PL, LAUDER MA, PEGG DTet al., 1986,

    ATOMIC INTERFEROMETERS - PHASE-DEPENDENCE IN MULTILEVEL ATOMIC TRANSITIONS

    , OPTICA ACTA, Vol: 33, Pages: 1129-1140, ISSN: 0030-3909
  • Conference paper
    CATHERALL JM, NEW GHC, 1986,

    ROLE OF SPONTANEOUS EMISSION IN THE DYNAMICS OF MODE-LOCKING BY SYNCHRONOUS PUMPING

    , Publisher: OPTICAL SOC AMER, Pages: P28-P29, ISSN: 0740-3224
  • Journal article
    ZENTENO LA, AVRAMOPOULOS H, NEW GHC, 1986,

    DETAILED ANALYSIS OF ACTIVE MODE-LOCKING

    , APPLIED PHYSICS B-PHOTOPHYSICS AND LASER CHEMISTRY, Vol: 40, Pages: 141-146, ISSN: 0721-7269
  • Journal article
    AGARWAL GS, COOPER J, HAAN SL, KNIGHT PLet al., 1986,

    ISOMORPHISM OF DC-FIELD-INDUCED INTERFERENCE AND LASER-INDUCED EFFECTS IN AUTOIONIZATION

    , PHYSICAL REVIEW LETTERS, Vol: 56, Pages: 2586-2589, ISSN: 0031-9007

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