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Chemistry: Recent submissions
Now showing items 681-700 of 964
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Hydrogen atoms in circularly polarized microwave fields: Near-integrability and ionization
(American Physical Society, 1995-08-01)We have recently found that the hydrogen atom in a circularly polarized (CP) microwave field possesses an approximate dynamical symmetry and its bounded motion can be well described by a three-dimensional integrable (but ... -
Generation of circularly polarized multiple high-order harmonic emission from two-color crossed laser beams
(American Physical Society, 1998-10-01)We present a scheme for the production of circularly polarized multiple high-order harmonic generation (HHG). The proposed experimental setup involves the use of two-color laser fields, consisting of a circularly polarized ... -
Generalized Floquet formulation of time-dependent current-density-functional theory
(American Physical Society, 1998-12-01)We present a generalized Floquet formulation of time-dependent current-density-functional theory for nonperturbative treatment of multiphoton processes of many-electron systems in intense monochromatic electric and magnetic ... -
High-order perturbation expansion of non-Hermitian Floquet theory for multiphoton and above-threshold ionization processes
(American Physical Society, 1999-12-14)A high-order perturbation theory is presented for efficient and accurate computation of multiphoton and above-threshold ionization cross sections of atoms and molecules in weak to medium strength laser fields. The procedure ... -
Many-mode Floquet theoretical approach for coherent control of multiphoton dynamics driven by intense frequency-comb laser fields
(American Physical Society, 2008-06-05)We extend the many-mode Floquet theorem (MMFT) for the investigation of multiphoton resonance dynamics driven by intense frequency-comb laser fields. The frequency comb structure generated by a train of short laser pulses ... -
Floquet formulation for the investigation of multiphoton quantum interference in a superconducting qubit driven by a strong ac field
(American Physical Society, 2009-03-03)We present a Floquet treatment of multiphoton quantum interference in a strongly driven superconducting flux qubit. The periodically time-dependent Schrödinger equation can be reduced to an equivalent time-independent ... -
Low-energy structure of above-threshold-ionization electron spectra: Role of the Coulomb threshold effect
(American Physical Society, 2011-06-10)Recent experimental observations of above-threshold ionization of rare gas atoms and diatomic molecules by midinfrared laser fields [C. I. Blaga et al., Nat. Phys. 5, 335 (2009); W. Quan et al., Phys. Rev. Lett. 103, 093001 ... -
High-order-harmonic generation in homonuclear and heteronuclear diatomic molecules: Exploration of multiple orbital contributions
(American Physical Society, 2011-04-22)We present a time-dependent density functional theory (TDDFT) approach with proper asymptotic long-range potential for nonperturbative treatment of high-order harmonic generation (HHG) of diatomic molecules with their ... -
Fast-kick-off monotonically convergent algorithm for searching optimal control fields
(American Physical Society, 2011-09-07)This Rapid Communication presents a fast-kick-off search algorithm for quickly finding optimal control fields in the state-to-state transition probability control problems, especially those with poorly chosen initial control ... -
Mechanism of quasi-phase-matching in a dual-gas multijet array
(American Physical Society, 2012-08-31)Quasi-phase-matching in a dual gas (Ar-H2) multijet array has recently been demonstrated to be a promising way to enhance the yield of high-order harmonics (HH). Here, we investigate the HH produced individually from these ... -
Maximum attainable field-free molecular orientation of a thermal ensemble with near–single-cycle THz pulses
(American Physical Society, 2013-01-25)Recently, single-cycle THz pulses have been demonstrated in the laboratory to successfully induce field-free orientation in gas-phase polar molecules at room temperature [Phys. Rev. Lett. 107, 163603 (2011)]. In this paper, ... -
Chasing charge localization and chemical reactivity following photoionization in liquid water
(American Institute of Physics, 2011-11-08)The ultrafast dynamics of the cationic hole formed in bulk liquid water following ionization is investigated by ab initio molecular dynamics simulations and an experimentally accessible signature is suggested that might ... -
Characterization of power induced heating and damage in fiber optic probes for near-field scanning optical microscopy
(American Institute of Physics, 2007-04-07)Tip-induced sample heating in near-field scanning optical microscopy (NSOM) is studied for fiber optic probes fabricated using the chemical etching technique. To characterize sample heating from etched NSOM probes, the ... -
Probing single molecule orientations in model lipid membranes with near-field scanning optical microscopy
(American Institute of Physics, 2000-02-01)Single molecule near-field fluorescence measurements are utilized to characterize the molecular level structure in Langmuir–Blodgett monolayers of L-α-dipalmitoylphosphatidylcholine (DPPC).Monolayers incorporating 3×10−4 ... -
Single molecule detection and underwater fluorescence imaging with cantilevered near-field fiber optic probes
(American Institute of Physics, 1998-04-03)Tapping-mode near-field scanning optical microscopy (NSOM) employing a cantilevered fiber optic probe is utilized to image the fluorescence from single molecules and samples in aqueous environments. The single molecule ... -
Sample heating in near-field scanning optical microscopy
(American Institute of Physics, 2005-10-05)Heating near the aperture of aluminumcoated,fiber opticnear-field scanning optical microscopy probes was studied as a function of input and output powers. Using the shear-force feedback method, near-field probes were ... -
Hybrid near-field scanning optical microscopy tips for live cell measurements
(American Institute of Physics, 2004-03-08)We report a near-field scanning optical microscopy (NSOM) probe that enables high-resolution imaging of living cells under physiological buffered conditions. The hybrid design combines a conventional fiber optic near-field ... -
Focused ion beam modification of atomic force microscopy tips for near-field scanning optical microscopy
(American Institute of Physics, 2001-12-01)A probe for near-field scanning optical microscopy is demonstrated based on a high index glass sphere attached to the end of a conventional atomic force microscopy tip. The sphere is machined into a pyramid geometry using ... -
Evaluation of thermal evaporation conditions used in coating aluminum on near-field fiber-optic probes
(American Institute of Physics, 1998-01-01)The effects that the thermal evaporation conditions have on the roughness of aluminum-coated near-field fiber-optic probes were investigated using the high-resolution capabilities of atomic force microscopy. The coating ... -
Characterization of Glycosylation Profiles of HIV-1 Transmitted/Founder Envelopes by Mass Spectrometry
(American Society for Microbiology, 2011-08-01)The analysis of HIV-1 envelope carbohydrates is critical to understanding their roles in HIV-1 transmission as well as in binding of envelope to HIV-1 antibodies. However, direct analysis of protein glycosylation by ...