Xiaoguo Zhou

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A novel threshold photoelectron-photoion coincidence (TPEPICO) imaging spectrometer at the U14-A beamline of the Hefei National Synchrotron Radiation Laboratory is presented. A set of open electron and ion lenses are utilized to map velocity imaging of photoelectrons and photoions simultaneously, in which a repelling electric field using an extra lens is(More)
In this work, the Raman spectrum of gaseous methanol in the C-H stretching region was investigated by polarized Photoacoustic Raman spectroscopy (PARS). On the basis of the depolarization ratio measurement and density functional theory (DFT) calculations, a complete spectral assignment has been presented. The band at ~2845 cm(-1) was assigned to CH3(More)
Most Eucalyptus plantations are intensively managed as short-rotation plantations and carbon (C) storage in plants and soils in stands older than 10 years is not well understood. We examined the changes in plant biomass C and soil organic C (SOC) storage across a chronosequence of E. urophylla × E. grandis forests (4-, 7-, 10-, 13-, and 21-year-old) in(More)
A combination of temperature-dependent Raman spectroscopy and quantum chemistry calculation was employed to investigate the blue shift of CH3 stretching vibration in methanol-water mixtures. It shows that the conventional O-H···O hydrogen bonds do not fully dominate the origin of the C-H blue shift and the weak C-H···O interactions also contribute to it.(More)
In this paper, the advanced Neural Network technology was introduced to the field of the wave impact force prediction. A three-layered BP neural network is employed and the units of input layer are wave style, wave period, incident wave height, relative clearance, relative width of wharf deck, and reflection coefficient of different shore connecting(More)
Using particle swarm optimization (PSO) to optimize BP neural network model is proposed in this paper. The new model is more quickly and accurate. The basic idea of this model is: Firstly PSO is used to optimize the BP neural network's initialized weights, an optimized result is got; then based on the optimized result the BP neural network is used for(More)
Sulfur difluoride radicals in their ground state have been produced by a "laser-free" pulsed dc discharge of the SF6Ar gas mixtures in a supersonic molecular beam and detected by mass-selective resonance-enhanced multilphoton ionization (REMPI) spectroscopy in the wavelength range of 408-420 nm. Analyses of the (3+1) REMPI excitation spectrum have enabled(More)
Three new triplet photosensitizers consisting of a bodipy derivative and C60 moieties were synthesized for triplet-triplet annihilation upconversion of perylene. With the extension of the π-conjugated structure of the bodipy derivative, the three photosensitizers exhibited different absorption wavelengths, e.g. 517 nm for B-2, 532 nm for B-4, and 557 nm for(More)
The development of potential probes to identify molecular conformation is essential in organic and biological chemistry. In this work, we investigated a site-specific C-H stretching vibration as a conformational probe for a model compound, 1,1,3,3,3-deuterated n-propanol (CD3CH2CD2OH), using stimulated photoacoustic Raman spectroscopy in the gas phase and(More)
Dissociative photoionization of methyl bromide (CH3Br) in an excitation energy range of 10.45-16.90 eV has been investigated by using threshold photoelectron-photoion coincidence (TPEPICO) velocity imaging. The coincident time-of-flight mass spectra indicate that the ground state X(2)E of CH3Br(+) is stable, and both A(2)A1 and B(2)E ionic excited states(More)