A5049115442- Advanced Chemical Physics Studies
- Spectroscopy and Laser Applications
- Mass Spectrometry Techniques and Applications
- Atomic and Molecular Physics
- Spectroscopy and Quantum Chemical Studies
- Atmospheric Ozone and Climate
- Atmospheric and Environmental Gas Dynamics
- Atmospheric chemistry and aerosols
- Photochemistry and Electron Transfer Studies
- Quantum, superfluid, helium dynamics
- Atomic and Subatomic Physics Research
- Catalytic Processes in Materials Science
- Graphene research and applications
- Advanced Fluorescence Microscopy Techniques
- Molecular Spectroscopy and Structure
- Phase Equilibria and Thermodynamics
- 2D Materials and Applications
- Various Chemistry Research Topics
- Nuclear physics research studies
- Molecular Junctions and Nanostructures
- Dark Matter and Cosmic Phenomena
- Ion-surface interactions and analysis
- Additive Manufacturing and 3D Printing Technologies
- Astrophysics and Star Formation Studies
- Particle accelerators and beam dynamics
Hangzhou Normal University
2017-2024
Zhejiang Normal University
2017-2024
University of Science and Technology of China
2015-2023
Jingdezhen Ceramic Institute
2023
Huazhong University of Science and Technology
2023
University of Chinese Academy of Sciences
2021-2022
Chinese Academy of Sciences
2010-2022
Southern University of Science and Technology
2019-2022
Dalian Institute of Chemical Physics
2010-2022
State Key Laboratory of Molecular Reaction Dynamics
2010-2021
Pinpointing the role of geometric phase During chemical reactions, electrons usually rearrange more quickly than nuclei. Thus, theorists often adopt an adiabatic framework that considers vibrational and rotational dynamics within single electronic states. Near regime where two states intersect, get complicated, a factor is introduced to maintain simplifying power treatment. Yuan et al. conducted precise experimental measurements validate this approach. They studied elementary H + HD reaction...
Abstract Hydrogen sulfide radicals in the ground state, SH(X), and hydrogen disulfide molecules, H 2 S, are both detected interstellar medium, but returned SH(X)/H S abundance ratios imply a depletion of former relative to that predicted by current models (which assume photon absorption at energies below ionization limit results + SH photoproducts). Here we report translational spectroscopy measurements atoms S( 1 D) formed photolysis jet-cooled molecules many wavelengths range 122 ≤ λ ≤155...
Abstract It has long been known that there is a conical intersection (CI) between the ground and first excited electronic state in H 3 system. Its associated geometric phase (GP) effect theoretically predicted to exist below CI since time. However, experimental evidence not established yet its dynamical origin waiting be elucidated. Here we report combined crossed molecular beam quantum reactive scattering dynamics study of H+HD → 2 +D reaction at 2.28 eV, which well CI. The GP clearly...
We have calculated the rovibronic structures which arise from simultaneous radial and angular couplings among lowest nine excited 1Σ+g, 1Πg, 1Δg states in H2, D2, T2. Using ab initio potential curves, adiabatic corrections, nonadiabatic coupling functions wherever possible, we solved coupled vibronic equations for all bound below 1s+2l dissociation limit up to J=5 H2 J=7 The good agreement of bulk data with spectroscopic results enables us eliminate spurious assignments old work (e.g.,...
In this article, we describe an experimental setup for studying tunable vacuum ultraviolet photochemistry using the H-atom Rydberg tagging time-of-flight technique. apparatus, two laser beams were used: one is generated by a nonlinear four-wave mixing scheme in Kr gas cell and fixed at 121.6 nm wavelength to probe product through Lyman α transition other beam, produced seeded free electron facility, can be continuously photodissociating molecules range of 50-150 with extremely high...
Photodissociation dynamics of H2O via the F̃ state at 111.5 nm were investigated using high resolution H-atom Rydberg “tagging” time-of-flight (TOF) technique, in combination with tunable vacuum ultraviolet free electron laser Dalian Coherent Light Source. The product translational energy distributions and angular both parallel perpendicular directions derived from recorded TOF spectra. Based on these distributions, quantum anisotropy parameters OH (X) (A) products have been determined. For...
In a two-dimensional (2D) metallic nanostructure, when sample's thickness is shorter than carrier mean free path, the ultrathin may influence and energy transport, owing to surface scattering. However, date, for 2D transition-metal carbides (MXenes), experiments calculations related scattering have not been performed. The contribution of structures in MXene yet be explored. Herein, reveal this effect, we design various models, including metal/MXene, dielectric/MXene, bulk structure, analyze...
The textbook mechanism for OCS photodissociation mainly involves the CO + S or CS O product channel via a single bond fission. However, third dissociation concerning cleavage of both C-S and C-O bonds yielding SO C products, though thermodynamically allowed, has never been verified experimentally to date. By using tunable vacuum ultraviolet laser light time-sliced velocity map ion imaging technique, we have clearly observed SO(X3Σ-) C(3PJ=0) products as photon energy gradually exceeds its...
Photodissociation dynamics of HNCO at photolysis wavelengths between 200 and 240 nm have been studied using the H-atom Rydberg tagging time-of-flight technique. Product translational energy distributions angular determined. At low photon excitation, product distribution is nearly statistical isotropic, which consistent with an indirect dissociation mechanism, i.e., internal conversion from S1 to S0 surface on surface. As increases, a direct pathway opens up. The appears be quite...
Vacuum ultraviolet photodissociation dynamics of nitrous oxide was investigated using the time-sliced velocity ion imaging technique. Images O((1)SJ=0) and O((3)PJ=2,1,0) products were measured at nine photolysis wavelengths from 124.44 to 133.20 nm, respectively. Three main dissociation channels: O((1)S0) + N2(X(1)Σg(+)), N2(A(3)Σu(+)), N2(B(3)Πg) observed identified in product images where vibrational states N2 fully resolved. Product total kinetic energy releases angular distributions...
Photodissociation of CO2 via the 1Πg state is investigated using a time-sliced velocity-mapped ion imaging apparatus combined with tunable vacuum ultraviolet photolysis source. The main O(1D2) + CO(X1Σ+) channel directly observed from measured images photoproducts at 129.08–134.76 nm. total kinetic energy release spectra determined based on these show that energetic thresholds for correspond to thermochemical photodissociation CO2(v2 = 0) and 1). One significant difference among CO(X1Σ+, v)...
Hydrogen chloride (HCl) contributes substantially to the atmospheric Cl; both species could affect composition of Earth's atmosphere and fate pollutants. Here, we present kinetics study for syn-CH3CHOO reaction with HCl using experimental measurement theoretical calculations. The experiment was conducted in a flow tube reactor at pressure 10 Torr temperatures ranging from 283 318 K by OH laser-induced fluorescence (LIF) method. Transition-state theory quantum chemistry calculations QCISD(T)...
Photodissociation of CH4 has been studied using the high-resolution Rydberg tagging time-of-flight technique. The TOF spectra show an important single C−H bond fission channel with partially resolved sharp features. Careful simulations indicate that these peaks are due to highly rotationally excited CH3 products, which likely produced through a conical intersection dissociation pathway between and ground potential energy surfaces. energy-dependent anisotropy parameter product also determined...
Understanding vacuum ultraviolet (VUV) photodissociation dynamics of CO2 is considerable importance in the study atmospheric chemistry and planetary chemistry. Yet, spin-forbidden O(3Pj=2,1,0) + CO(X1Σ+) channel has not been clearly understood so far. Here, we O(3Pj) dissociation processes VUV at photolysis wavelengths between 129.02 134.67 nm by using time-sliced velocity-mapped ion imaging technique. From vibrational-resolved images photofragment, total kinetic energy releases, cofragment...
State-to-state photodissociation of carbon dioxide (CO2) via the 3p1Πu Rydberg state was investigated by time-sliced velocity map ion imaging technique (TSVMI) using a tunable vacuum ultraviolet free electron laser (VUV FEL) source. Raw images O(1S) products resulting from + CO(X1Σ+) channel were acquired at photolysis wavelengths between 107.37 and 108.84 nm. From vibrational resolved images, product total kinetic energy releases distributions co-products obtained, respectively. It is found...
We report on an experimental study of the vacuum ultraviolet photodissociation dynamics nitrous oxide as a function photolysis wavelength. In this study, both N((2)DJ) + NO(X(2)Π) and N((2)PJ) product channels were investigated using time-sliced velocity ion imaging technique. Images N((2)DJ=5/2,3/2) N((2)PJ=3/2,1/2) products measured at seven ten, respectively, wavelengths between 124.44 133.20 nm. The vibrational states NO partially resolved in acquired raw images. total kinetic energy...
Photodissociation dynamics of the H-atom channel from HNCO photolysis between 124 and 137 nm have been studied using Rydberg tagging time-of-flight technique. Product translational energy distributions angular determined. Two dissociation channels, H + NCO (X(2)Π) NCO(A(2)Σ(+)), observed. The former involves two different pathways; one is a slow predissociation pathway through internal conversion excited state to S0 state, other fast S1 state. latter dominates by prompt via coupling S2 As...
The S1 state decay dynamics of 2-hydroxypyridine following UV excitation at a wavelength range 276.9−250.0 nm is investigated using femtosecond time-resolved photoelectron imaging technique. Based on pump dependence the dynamics, refined picture proposed. At 276.9 nm, depopulated through intersystem crossing to lower triplet state(s). 264.0 both state(s) and internal conversion ground are in operation. 250.0 becomes dominated.
The spin-forbidden O(3P2) + CO(X1Σ+, v) channel formed from the photodissociation of CO2 in low energy band centered at 148 nm is investigated by using time-sliced velocity-mapped ion imaging technique. vibrational-resolved images photoproducts measured photolysis wavelength range 144.62-150.45 are analyzed to give total kinetic releases (TKER) spectra, CO(X1Σ+) vibrational state distributions, and anisotropy parameters (β). TKER spectra reveal formation correlated with well resolved v =...
We study the vacuum ultraviolet (VUV) photodissociation dynamics of carbonyl sulfide (OCS) by using time sliced velocity map ion imaging technique. Experimental images dissociative O (3PJ=0,1,2) products were acquired at five VUV photolysis wavelengths from 133.26 to 139.96 nm that correspond F Rydberg state OCS. High vibrational states carbon monosulfide (CS) co-products are partially resolved in images. The product total kinetic energy releases, angular distributions, and branching ratios...
We report the study of photodissociation dynamics nitrous oxide in vacuum ultraviolet region, using time-sliced velocity map ion imaging technique. Ion images O(1S0) and O(3P J=2,1,0) products were measured at nine photolysis wavelengths from 142.55 to 148.79 nm. The product channels + N2(X1Σg+) N2(A3Σu+) have been observed. For these dissociation channels, total kinetic energy releases dissociated acquired. With vibrational structures N2 coproducts partially resolved experimental images,...
Vacuum ultraviolet photodissociation dynamics of carbonyl sulfide (OCS) was investigated by using the time-sliced velocity map ion imaging technique. Images S(1SJ=0) and S(3PJ=2,1,0) photofragments formed in OCS were acquired at six photolysis wavelengths from 147.24 to 156.48 nm. Vibrational states CO coproducts partially resolved identified images. Two main dissociation product channels, namely, spin-allowed + CO(X1Σg+) spin-forbidden CO(X1Σg+), observed. At each wavelength, total kinetic...