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Journal articleShao YL, Ditmire T, Tisch JWG, et al., 1996,
Multi-keV electron generation in the interaction of intense laser pulses with xe clusters
, PHYSICAL REVIEW LETTERS, Vol: 77, Pages: 3343-3346, ISSN: 0031-9007- Author Web Link
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- Citations: 334
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Journal articleGarraway BM, Knight PL, 1996,
Cavity modified quantum beats
, PHYSICAL REVIEW A, Vol: 54, Pages: 3592-3602, ISSN: 1050-2947- Author Web Link
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- Citations: 82
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Journal articleDalton BJ, Guerra ES, Knight PL, 1996,
Field quantization in dielectric media and the generalized multipolar Hamiltonian
, PHYSICAL REVIEW A, Vol: 54, Pages: 2292-2313, ISSN: 1050-2947- Author Web Link
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- Citations: 57
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Journal articleLappas DG, Sanpera A, Watson JB, et al., 1996,
Two-electron effects in harmonic generation and ionization from a model He atom
, JOURNAL OF PHYSICS B-ATOMIC MOLECULAR AND OPTICAL PHYSICS, Vol: 29, Pages: L619-L627, ISSN: 0953-4075- Author Web Link
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- Citations: 78
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Journal articleProtopapas M, Keitel CH, Knight PL, 1996,
Relativistic mass shift effects in adiabatic intense laser field stabilization of atoms
, JOURNAL OF PHYSICS B-ATOMIC MOLECULAR AND OPTICAL PHYSICS, Vol: 29, Pages: L591-L598, ISSN: 0953-4075- Author Web Link
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- Citations: 47
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Journal articleGou SC, Knight PL, 1996,
Trapped ions as vibrational beam splitters: SU(2) states in a two-dimensional ion trap
, PHYSICAL REVIEW A, Vol: 54, Pages: 1682-1685, ISSN: 1050-2947- Author Web Link
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- Citations: 49
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Journal articleGou SC, Steinbach J, Knight PL, 1996,
Dark pair coherent states of the motion of a trapped ion
, PHYSICAL REVIEW A, Vol: 54, Pages: R1014-R1017, ISSN: 1050-2947- Author Web Link
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- Citations: 122
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Journal articlePosthumus JH, Giles AJ, Thompson M, et al., 1996,
The dissociation dynamics of diatomic molecules in intense laser fields
, JOURNAL OF PHYSICS B-ATOMIC MOLECULAR AND OPTICAL PHYSICS, Vol: 29, Pages: L525-L531, ISSN: 0953-4075- Author Web Link
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- Citations: 68
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Journal articleHinds EA, Sauer BE, Wang J, 1996,
Laser‐rf double resonance spectroscopy of 174YbF in the X 2Σ+ state: Spin‐rotation, hyperfine interactions, and the electric dipole moment
, Journal of Chemical Physics, ISSN: 0021-9606 -
Journal articleWatson JB, Keitel CH, Knight PL, et al., 1996,
Entropic measure of wave-packet spreading and ionization in laser-driven atoms
, PHYSICAL REVIEW A, Vol: 54, Pages: 729-735, ISSN: 2469-9926- Author Web Link
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- Citations: 32
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Journal articleFrasinski LJ, Giles AJ, Hatherly PA, et al., 1996,
Covariance mapping and triple coincidence techniques applied to multielectron dissociative ionization
, Journal of Electron Spectroscopy and Related Phenomena, Vol: 79, Pages: 367-371, ISSN: 1873-2526Single versus multiphoton multiple ionization of diatomic and triatomic molecules is discussed. The former experiments use synchrotron radiation, while the latter ones require pico- or femtosecond laser pulses focused to an intensity exceeding 1014 W/cm2. A method of improving covariance maps by decorrelating laser fluctuations is presented. Removal of false coincidences in triple coincidence experiments is extended to a varying excitation rate. An explanation of the multielectron dissociative ionization mechanism is sought in terms of bond softening, bond hardening (stabilisation), and ionization enhancement due to Stark-shift excitation. It is expected that this excitation is accompanied by emission of vacuum ultraviolet radiation that differs from high harmonic generation.
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Journal articleDutra SM, Knight PL, 1996,
Spontaneous emission in a planar Fabry-Perot microcavity
, PHYSICAL REVIEW A, Vol: 53, Pages: 3587-3605, ISSN: 2469-9926- Author Web Link
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- Citations: 51
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Conference paperShao YL, Fraser DJ, Hutchinson MHR, et al., 1996,
Two-colour strong-field ionization and dissociation of H-2 using 780 and 390 nm femtosecond pulses
, 12th National Quantum Electronics Conference, Publisher: TAYLOR & FRANCIS LTD, Pages: 1063-1070, ISSN: 0950-0340- Author Web Link
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- Citations: 3
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Conference paperRippin MA, New GHC, 1996,
Excess noise factors in circular unstable resonators
, 12th National Quantum Electronics Conference, Publisher: TAYLOR & FRANCIS LTD, Pages: 993-1008, ISSN: 0950-0340- Author Web Link
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- Citations: 16
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Journal articleCiarrocca M, Marangos JP, Burgess DD, et al., 1996,
Spectral shifting by optical and collisional ionization of an intense laser pulse in dense noble gases
, JOURNAL OF THE OPTICAL SOCIETY OF AMERICA B-OPTICAL PHYSICS, Vol: 13, Pages: 794-804, ISSN: 0740-3224- Author Web Link
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- Citations: 1
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Journal articleProtopapas M, Lappas DG, Keitel CH, et al., 1996,
Recollisions, bremsstrahlung, and attosecond pulses from intense laser fields
, PHYSICAL REVIEW A, Vol: 53, Pages: R2933-R2936, ISSN: 2469-9926- Author Web Link
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- Citations: 94
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Journal articlePlenio MB, Knight PL, 1996,
Realistic lower bounds for the factorization time of large numbers on a quantum computer
, PHYSICAL REVIEW A, Vol: 53, Pages: 2986-2990, ISSN: 2469-9926- Author Web Link
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- Citations: 118
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Journal articleRippin MA, Knight PL, 1996,
Modified spontaneous emission in cylindrical microcavities: Waveguiding and distributed Bragg reflecting structures
, JOURNAL OF MODERN OPTICS, Vol: 43, Pages: 807-853, ISSN: 0950-0340- Author Web Link
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- Citations: 25
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Journal articleHinds EA, Sandoghdar V, Sukenik CI, et al., 1996,
Spectroscopy of atoms confined to the single node of a standing wave in a parallel-plate cavity
, Physical Review A, ISSN: 1050-2947 -
Journal articleGarraway BM, Knight PL, 1996,
The localization and survival of cats in a Kerr medium
, OPTICS COMMUNICATIONS, Vol: 123, Pages: 517-522, ISSN: 0030-4018- Author Web Link
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- Citations: 5
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Journal articlePower WL, Knight PL, 1996,
Stochastic simulations of the quantum Zeno effect
, PHYSICAL REVIEW A, Vol: 53, Pages: 1052-1059, ISSN: 1050-2947- Author Web Link
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- Citations: 39
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Journal articlePlenio MB, Knight PL, Thompson RC, 1996,
Inhibition of spontaneous decay by continuous measurements. Proposal for realizable experiment
, OPTICS COMMUNICATIONS, Vol: 123, Pages: 278-286, ISSN: 0030-4018- Author Web Link
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- Citations: 48
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Journal articleChavezCerda S, McDonald GS, New GHC, 1996,
Nondiffracting beams: Travelling, standing, rotating and spiral waves
, OPTICS COMMUNICATIONS, Vol: 123, Pages: 225-233, ISSN: 0030-4018- Author Web Link
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- Citations: 97
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Conference paperHorvath GZK, Dholakia K, Hernandez-Pozos JL, et al., 1996,
Theoretical calculation and experimental measurement of an `avoided crossing' in the combined ion trap
Calculation of the oscillation frequencies of ions confined in a trap, which combines the static and magnetic fields of a Penning trap with the oscillating electric field of a radiofrequency trap, takes into account a possible misalignment of the magnetic field direction with respect to trap symmetry axis. The resulting ion oscillation frequencies are similar to those of a perfect trap, except that there is an `avoided crossing' near the point where the axial and upper radial frequency would degenerate without misalignment. The measured frequencies and the variation of the gap magnitude with angle is in agreement with the theoretical model and can form the basis for aligning a combined or Penning trap accurately with external magnetic field.
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Conference paperBerkeland DJ, Hinds EA, Boshier MG, 1996,
Precise laser spectroscopy of hydrogen and singly-ionized helium
, Pages: 172-173, ISSN: 0589-1485We have measured the hydrogen 1S Lamb shift to be 8,172,827(51) kHz, the most precise value for any Lamb shift. The result is in reasonable agreement with the predictions of quantum electrodynamics (QED), although its interpretation as a test of QED is limited by the uncertainty in the proton charge radius. A measurement of the He+(2S) Lamb shift by laser spectroscopy can bypass this limitation and investigate a nine standard deviation discrepancy between theory and experiment for this Lamb shift.
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Journal articleRitsataki A, French PMW, New GHC, 1996,
Numerical model of Kerr-lens mode-locking
, Conference Proceedings - Lasers and Electro-Optics Society Annual Meeting-LEOS, ISSN: 1092-8081In recent years, there has been a great deal of interest in Kerr-lens mode-locking (KLM) in view of its implications for femtosecond pulse generation in solid-state lasers. Simple criteria for determining the cavity parameters that maximize the nonlinear amplitude modulation and promote self-starting have been sought, with attention centered on the parameter δ defined as the relative change of beam size w with power P at one of the cavity mirrors (δ = ((1/w)∂w/∂P)P→0). Optimal KLM operation occurs when δ exhibits its most negative value. The aim of this work has been to develop a general numerical model to calculate values of δ in both the tangential and sagittal planes, taking into consideration astigmatism introduced by off-axis spherical mirrors and Brewster-angled surfaces, nonlinear coupling of the beam sizes between the two planes of polarization, self-focusing and gain-guiding. The way in which contour plots of δ(x, z) change with the introduction of each of the above effects into the model and the effect on the optimum region for KLM have been studied.
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Conference paperFeng X, Hernandez-Pozos JL, Vincent J, et al., 1996,
Quantum effects in trapped beryllium ions
Two experiments looking at the different aspects of the quantum theory of the interaction of radiation with atoms (ions) are reported. The first experiment investigates the quantum Zeno effect in which an atomic transition is `slowed down' by repeated measurements of the state of the system. The second experiment takes advantage of the unique properties of trapped ions to study cavity quantum electrodynamics (QED) effects, in particular, the modifications to the spontaneous emission of trapped ions held at the center of an optical cavity. The magnitude of the cavity's effect on the atomic emission increases with decreasing cavity mode volume so that small cavities and hence small traps are needed.
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Journal articlePetch JC, Keitel CH, Knight PL, et al., 1996,
Role of electromagnetically induced transparency in resonant four-wave-mixing schemes
, PHYSICAL REVIEW A, Vol: 53, Pages: 543-561, ISSN: 1050-2947- Author Web Link
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- Citations: 106
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Journal articleIvanov MY, Matusek DR, Wright JS, 1996,
Exchange reactions in intense infrared laser fields
, PHYSICAL REVIEW A, Vol: 54, Pages: 5159-5170, ISSN: 1050-2947We examine the role of the dipole moment induced by an intense nonresonant infrared laser field on exchange reactions of the type A + BC –> AB + C. This is compared to previous work which included the effect of the permanent dipole moment and its variation along the reaction coordinate. The formalism for laser-molecule interaction is developed for the cases where the reciprocal laser frequency is comparable to or much shorter than the time required for the system to cross the transition state. It is predicted that the induced dipole moment will both lower the electronic barrier to reaction and also create bound states along the reaction path. Results of classical trajectory calculations are presented for the collinear H + H-2 –> H + H reaction, using ab initio dipole moment and polarizability surfaces. It is found that the collisional energy threshold for reaction is lowered significantly, and that the effects of the induced dipole moment dominate over those of the permanent dipole moment. A time-dependent analysis of the reaction shows that the fluctuating barrier can occasionally be very low when the transition state is approached, allowing trajectories to be reactive with very low collision energies.
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Journal articleMatusek DR, Ivanov MY, Wright JS, 1996,
IR laser enhancement of the H+H-2 reaction on an accurate dipole moment surface
, CHEMICAL PHYSICS LETTERS, Vol: 258, Pages: 255-259, ISSN: 0009-2614This Letter reports an accurate dipole moment surface for collinear H-3. Using this surface, we examine the H + H-2 reaction dynamics in infrared laser fields. IR laser light interacting with the system via the dipole moment (A.E. Orel and W.H. Miller, Chem. Phys. Lett. 57 (1978) 362) has no effect on the system at moderate intensitites (e.g. 10(12) W/cm(2)), and the interaction only becomes significant at higher intensities where other processes become important. However, the shape of the collinear reaction probability obtained by Orel and Miller using an assumed dipole surface shows remarkable agreement with the results obtained in this more quantitative study.
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