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Chemistry: Recent submissions
Now showing items 641-660 of 964
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Time‐resolved two‐photon induced anisotropy decay: The rotational diffusion regime
(American Institute of Physics, 1994-09-01)Two‐photon excitation (TPE) of randomly oriented chromophores in solution generates an anisotropic distribution. In a previous paper [Chem. Phys. 179, 513 (1994)], the polarization dependence of the TPE signal probed by a ... -
Picosecond Time-Resolved Fourier Transform Raman Spectroscopy of 9,10-Diphenylanthracene in the Excited Singlet State
(Optical Society of America, 1995-05-01)Time-resolved Fourier transform Raman spectroscopy of the highly fluorescent chromophore 9,10-diphenylanthracene (DPA) in cyclohexane and ethanol is described. Raman spectra of the first excited singlet state of DPA were ... -
Influence of temperature and viscosity on anthracene rotational diffusion in organic solvents: Molecular dynamics simulations and fluorescence anisotropy study
(American Institute of Physics, 1997-01-01)Molecular dynamics simulations and fluorescenceanisotropy decay measurements are used to investigate the rotational diffusion of anthracene in two organic solvents—cyclohexane and 2-propanol—at several temperatures. Molecular ... -
Two-photon microscopy with wavelength switchable fiber laser excitation
(Optical Society of America, 2006-10-16)Two-photon scanning fluorescence microscopy has become a powerful tool for imaging living cells and tissues. Most applications of two-photon microscopy employ a Ti:sapphire laser excitation source, which is not readily ... -
Switching of 800 nm femtosecond laser pulses using a compact PMN-PT modulator
(American Institute of Physics, 2009-03-13)A voltage-controlled birefringent cell based on ceramic PMN-PT material is used to enable fast intensity modulation of femtosecond laser pulses in the 800 nm wavelength window. The birefringent cell based on a PMN-PT ... -
A distribution-based method to resolve single-molecule Förster resonance energy transfer observations
(American Institute of Physics, 2011-04-12)We introduce a new approach to analyze single-molecule Förster resonance energy transfer (FRET) data. The method recognizes that FRET efficiencies assumed by traditional ensemble methods are unobservable for single molecules. ... -
Tunable excitation source for coherent Raman spectroscopy based on a single fiber laser
(American Institute of Physics, 2011-10-01)We demonstrate a wavelength tunable optical excitation source for coherent Raman scattering (CRS) spectroscopy based on a single femtosecondfiber laser. Electrically controlled wavelength tuning of Stokes optical pulses ... -
Exploring chemical diversity via a modular reaction pairing strategy
(Beilstein-Institut, 2012-08-15)The efficient synthesis of an 80-member library of unique benzoxathiazocine 1,1-dioxides by a microwave-assisted, intermolecular nucleophilic aromatic substitution (SNAr) diversification pathway is reported. Eight benzofused ... -
Measurement of the Translational Energy of Ions with a Time‐of‐Flight Mass Spectrometer
(American Institute of Physics, 1967-01-01)A mathematical analysis of peak shapes in a Bendix time‐of‐flight mass spectrometer shows that ions formed with excess translational energy exhibit considerable peak broadening. A method is developed by which this translational ... -
Appearance Potentials and Kinetic Energies of Ions from N2, CO, and NO
(American Institute of Physics, 1967-01-01)A recently developed method has permitted the measurement of excess translational energy of ions formed in a time‐of‐flight mass spectrometer. The method, in conjunction with the RPD technique for determining appearance ... -
Energy Dependence of Energy Partition in Products of Direct Reactions: Crossed‐Beam Studies and a New Model
(American Institute of Physics, 1968-01-01) -
Direct Mechanism of Reaction CH3 ++CH4→C2H5 ++H2
(American Institute of Physics, 1969-01-01) -
Chemical Accelerator Studies of Isotope Effects on Collision Dynamics of Ion–Molecule Reactions: Elaboration of a Model for Direct Reactions
(American Institute of Physics, 1970-01-01)Crossed‐beam studies on isotopic variants of the reaction Ar+ + H2→ArH+ are reported. Both velocity and angular distributions of the ionic product as a function of initial translational energy, down to 0.1 eV (center of ... -
Studies of Charge Exchange in a High‐Pressure Pulsed Electron Impact Source
(American Institute of Physics, 1972-01-01)A high pressure pulsed ion source has been used in a time‐of‐flight mass spectrometer in order to study the charge exchangereactions in Ar–H2 and Ar–D2 systems using the ion source in the Čermák mode of operation. As the ... -
Observation of a translational energy threshold for a highly exoergic ion‐molecule reaction
(American Institute of Physics, 1974-01-01) -
Role of impact parameter in branching reactions
(American Institute of Physics, 1975-01-01) -
Excitation functions for the reactions of Ar^+ with CH4, CD4, and CH2D2
(American Institute of Physics, 1975-01-01)Integral reaction cross sections as a function of initial translational energy (0.4–30 eV c.m.) are reported for isotopic variants of the exoergic ion‐molecule reaction Ar++CH4 → ArH++CH3. The excitation functions, which ... -
Chemical accelerator studies of reaction dynamics: Ar^+ + CH4 → ArH^+ + CH3
(American Institute of Physics, 1975-01-01)Chemical accelerator studies on isotopic variants of the reaction Ar+ + CH4 → ArH+ + CH3 are reported. Velocity and angular distributions of the ionic product as a function of initial translational energy have been measured ... -
Observation of a stripping threshold for the reaction N2 ^++CH4→N2H^++CH3
(American Institute of Physics, 1976-01-01)Chemical accelerator studies on isotopic variants of the reaction N2 ++CH4→N2H++CH3 are reported. Reaction cross sections, as well as velocity and angular distributions of the ionic products have been measured as a function ... -
Dynamics of the ion–molecule reaction Kr+(H2,H)KrH+
(American Institute of Physics, 1976-01-01)