A5101720996- Plasma Diagnostics and Applications
- Plasma Applications and Diagnostics
- Laser-induced spectroscopy and plasma
- Advanced Chemical Physics Studies
- Atomic and Molecular Physics
- Electrohydrodynamics and Fluid Dynamics
- Spectroscopy and Laser Applications
- Mass Spectrometry Techniques and Applications
- Laser-Plasma Interactions and Diagnostics
- Metal and Thin Film Mechanics
- Diamond and Carbon-based Materials Research
- Atmospheric Ozone and Climate
- Analytical chemistry methods development
- Astrophysics and Star Formation Studies
- Magnetic confinement fusion research
- Molecular Spectroscopy and Structure
- Catalytic Processes in Materials Science
- Atmospheric chemistry and aerosols
- Nuclear Physics and Applications
- Laser Design and Applications
- Aerosol Filtration and Electrostatic Precipitation
- Gas Sensing Nanomaterials and Sensors
- Terahertz technology and applications
- Ion-surface interactions and analysis
- Optical measurement and interference techniques
Dalian University of Technology
2015-2025
Dalian University
2018-2023
Materials Modification (United States)
2023
Xi'an Jiaotong University
2016
BaiCheng Normal University
2010
University of Basel
2001-2008
Technical University of Denmark
1996
Non-thermal plasma holds great potentials as an efficient, economical and eco-friendly seed pretreatment method for improving the germination seedling growth, but mechanisms is still unclear. Therefore, a plant model organism Arabidopsis thaliana was used to investigate physio-biochemical responses of seeds non-thermal at different treatment times by measuring growth parameters, redox-related calcium (Ca2+) level physicochemical modification surface. The results showed that short-time (0.5,...
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...
The diagnosis of the fuel retention and impurity deposition on plasma facing components (PFCs) is very important for monitoring plasma-wall interactions improving performance long-pulse operation tokamak devices. In this study, a remote in situ laser-induced breakdown spectroscopic (RIS-LIBS) system has been developed to be an effective routine method composition PFCs Experimental Advanced Superconducting Tokamak (EAST). RIS-LIBS can operated between EAST discharges via network control...
Abstract The detailed features of molecular photochemistry are key to understanding chemical processes enabled by non-adiabatic transitions between potential energy surfaces. But even in a small molecule like hydrogen sulphide (H 2 S), the influence is not yet well understood. Here we report high resolution translational spectroscopy measurements H and S( 1 D) photoproducts formed following excitation S selected quantum levels Rydberg state with B electronic symmetry at wavelengths λ ~ 139.1...
Abstract Surface micro-discharge (SMD) has attracted extensive attention in recent years due to its potential use for a variety of promising applications the fields environmental protection, agriculture, and biomedicine. Generally, plasma is not direct contact with treated objects, transport reactive species across inherent physical distance from electrode object typically assumed be controlled by electrohydrodynamic force. Power considered major player when trying relate parameters...
The spatio-temporal evolution of laser ablation W plasma under low-pressure conditions in a continuous Ar ambient was investigated and compared to that gas ambient.
The B 3Σu−←X 3Σg− transitions of HC13H and HC19H have been measured in the gas phase, exhibiting broad, Lorentzian shaped bands. More extensive A spectra observed for HC2n+1H (n=3–6) than before with many new vibronic bands identified. were obtained by means a mass selective resonant two-color two-photon ionization technique coupled to supersonic plasma source. electronic structures this series molecules (n=2–9) both ground excited states investigated using DFT, MP2, state-averaged CASSCF...
Hydrogen sulfide (H2S) is the most abundant S-bearing molecule in solar nebula. Although its photochemistry has been studied for decades, H2 fragment channel still not well-understood. Herein, we describe photodissociation dynamics of H2S + hv → S(1S) H2(X1Σg+) with excitation wavelength 122 nm ≤ λ 136 nm. The results reveal that H2(X) fragments formed are significantly vibrationally excited, quantum yields ∼87% populated vibrational levels v″ = 3, 4, 5, and 6. Theoretical analysis suggest...
The electronic spectra of C(18) and C(22) in the 15 150-36 900 cm(-1) range have been detected gas phase by a mass-selective resonant two-color two-photon ionization technique coupled to laser ablation source. were assigned several systems monocyclic cumulenic isomers with D(9 h) symmetry for D(11 C(22), based on time-dependent-density-functional calculations reactivity respect H(2). best cooling conditions achieved Kr as buffer gas, origin A(1)A(2) (")<--X(1)A(1) (') transition at 592.89 nm...
Airglow is a well-known phenomenon in the Earth's upper atmosphere, which arises from emissions of energetic atoms and molecules. The Meinel band emission high vibrationally excited OH(X) radicals one more important contributors to airglow mesosphere/lower thermosphere. H + O3 reaction has long been regarded as dominant source these OH(X, v) radicals. Here we demonstrate that vacuum ultraviolet (VUV) photolysis water vapor at λ ∼ 112.8 nm represents another exceptionally highly radicals,...
As advanced linear plasma sources, cascaded arc devices have been used to generate steady with high electron density, particle flux and low temperature. To measure density temperature of the device accurately, a laser Thomson scattering (LTS) system, which is generally recognized as most precise diagnostic method, has established in our lab Dalian University Technology. The measured successfully region 4.5 × 1019 m−3 7.1 1020 0.18 eV 0.58 eV. For comparison, an optical emission spectroscopy...
A Nd:YAG laser with a power density of 15 GW/cm2, operating at wavelength 1064 nm, was used to ablate tungsten (W) target placed in an ambient atmosphere air pressure 10 mbar. systematic study plasma properties employing fast photography and time space resolved optical emission spectroscopy carried out. The results showed that there were continuum, neutral, singly ionized W atom the laser-induced plasma; spectra gas N2 N2+ aslo observed which appeared very early times (&lt;30 ns)....
Abstract The detachment processes of the hydrogen (H) and deuterium (D) plasmas are comparatively investigated in linear plasma device NAGDIS-II. laser Thomson scattering measurements demonstrate that recombination rate H is greater than D as neutral pressure increases molecular activated (MAR) dominant phase. As process by MAR strongly dependent on vibrational rotationally excited states molecule, rovibrational quantum state populations molecules measured using Fulcher- α band spectroscopy....
The electronic spectrum of C3H has been observed by means a resonant two color photon ionization technique sampling supersonic plasma source. On the basis ab initio calculations, vibrational and rotational analysis, complex vibronic system in visible near UV is assigned to three transitions, Ã 2A′←X 2Π, B̃ 2A″←X 2Π C̃ C3H. Potential curves along CCH bending coordinate have obtained because its role for dynamics
The visible electronic spectra of the linear l-C2n+1H (n=2–4) radicals have been measured in gas phase. These obtained by means a mass-selective resonant two-color two-photon ionization technique coupled to supersonic plasma source. observed are assigned A 2Δ←X 2Π, B 2Σ−←X and C 2Σ+←X 2Π transitions arising from σ→π electron promotion. assignments based on ab initio calculations, wavelength dependence 000 transition size, isotopic substitution. lifetime broadening bands effects due vibronic...
In this paper, a low pressure Ar/N2 shock plasma jet with clearly multicycle alternating zones produced by DC cascade arc discharge has been investigated an emission spectral method combined Abel inversion analysis. Plasma intensity, electron, vibrational and rotational temperatures of the have measured in expansion compression zones. The results indicate that ranges electron temperature, temperature are 1.1 eV to 1.6 eV, 0.2 0.7 0.19 0.22 respectively, it is found for first time increase...
The electron density and temperature of the recombining argon plasma from a cascaded arc discharge source were measured by laser Thomson scattering approach. In this paper, small amount nitrogen gas was introduced into source. addition applied to investigate change parameters in terms temperature. measurements showed that dropped 2 orders magnitude at 10% compared with no addition. dissociative recombination following charge transfer between atomic ions molecules responsible for decrease...
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)...
The gas phase spectrum of the cyclic C18 molecule recorded in laboratory at a temperature typical diffuse interstellar clouds is compared with absorption features toward ζ Oph and HD 204827 5730-5934 Å region. For origin band 5928.5 an upper limit to column density ≤1.8 × 1011 cm-2 inferred. pattern changes on lowering internal 100-20 K range bears striking resemblance observed structure number DIBs other wavelengths. This suggests that platelike molecules or ions, comprising couple dozen...
Electronic transitions of MgC2nH (n = 1-3) have been observed in the gas phase visible region. A mass-selective, resonant two-color two-photon ionization technique, coupled with a laser ablation source, was used. Ab initio calculations geometries, energies, and vertical electronic excitations carried out using hybrid density functional theory coupled-cluster approach. The spectra are assigned as A2Π ← X2Σ+ transition linear chains. origin bands located at 4383, 4453, 4525 Å for MgC2H, MgC4H,...
The electronic spectrum of the aluminium containing species AlCCH has been detected in gas phase region 315–355 nm. experiment used a mass selective resonant two-color two-photon ionization technique coupled to laser ablation source. Structures isomers have optimized using density functional theory (DFT) and excitation energies low-lying excited states calculated. Based on analysis observed rotational structure theoretical data, is assigned A 1Π ← X 1Σ+ transition linear AlCCH. vibronic band...