A5058076526- Advanced Chemical Physics Studies
- Gas Sensing Nanomaterials and Sensors
- Atmospheric Ozone and Climate
- Catalysis and Oxidation Reactions
- Atomic and Molecular Physics
- Analytical Chemistry and Sensors
- Luminescence Properties of Advanced Materials
- Spectroscopy and Laser Applications
- Atmospheric chemistry and aerosols
- Laser-Plasma Interactions and Diagnostics
- Advanced Photocatalysis Techniques
- Inorganic Fluorides and Related Compounds
- Silicone and Siloxane Chemistry
- Perovskite Materials and Applications
- Chemical Synthesis and Characterization
- Thermal and Kinetic Analysis
- Industrial Gas Emission Control
- Porphyrin and Phthalocyanine Chemistry
- ZnO doping and properties
- Nuclear Physics and Applications
- Radiation Detection and Scintillator Technologies
- Quantum, superfluid, helium dynamics
- Zeolite Catalysis and Synthesis
- Ammonia Synthesis and Nitrogen Reduction
- Solid-state spectroscopy and crystallography
Rice University
2015-2022
Institute of Atomic and Molecular Sciences, Academia Sinica
2004
Tzu Chi College of Technology
2002-2004
Tzu Chi University
1997-2001
National Tsing Hua University
1992-1997
Abstract We report results of new pair creation experiments using ~100 Joule pulses the Texas Petawatt Laser to irradiate solid gold and platinum targets, with intensities up ~1.9 × 10 21 W.cm −2 pulse durations as short ~130 fs. Positron electron (e+/e−) ratios >15% were observed for many thick disk rod highest e+/e− ratio reaching ~50% a Pt rod. The inferred yield was ~ few ×10 emerging density ~10 15 /cm 3 so that skin depth becomes < jet transverse size. These represent major...
The large shifts (−30.5 and +41.7 cm−1, respectively) of the IR absorption lines nitric acid (HONO2) in a N2 matrix ν1 (OH stretching) ν3 (HON bending) vibrational modes, relative to those observed for HONO2 an Ar matrix, indicate strong interaction between N2. Photolysis solid produced predominantly HOONO, whereas relatively intense N2O HONO were after photolysis with mercury lamp, yield HOONO decreased by more than factor 10. Possible photochemical processes are discussed.
A new type of compact high-resolution high-sensitivity gamma-ray spectrometer for short-pulse intense gamma-rays (250 keV to 50 MeV) has been developed by combining the principles scintillators and attenuation spectrometers. The first prototype this scintillator (SAS) was tested successfully in Trident laser experiments at LANL. Later versions have used extensively Texas Petawatt Austin, TX, more recently OMEGA-EP LLE, Rochester, NY. SAS is particularly useful high-repetition-rate...
Disulfur oxide (denoted as SSO) isolated in solid Ar at 13 K was irradiated with light 308 nm from a XeCl excimer laser. New lines 799.1 (797.0), 574.9, and 544.1 (545.6) cm−1, observed after photolysis, are assigned to cyclic S2O Cyc-S2O) ∠S–O–S≅72.5±3.0° based on results of S34- O18-isotopic experiments; parentheses associated minor matrix site the broad line 574.9 cm−1 may be deconvoluted two 575.4 574.6 cm−1. Secondary photolysis 248 diminishes cyc-S2O produces SSO. Theoretical...
Potassium nitrate (KNO3) isolated in solid argon at 13 K was irradiated with emission from an ArF excimer laser 193 nm. Recombination of the photofragments led to formation both cis- and trans-potassium peroxynitrites (KOONO). The cyclic conformer, cis-KOONO, absorbs 1444.5, 952.3, 831.6, 749.1 cm−1, whereas trans-KOONO 1528.4, 987.4, 602.2 cm−1. assignments are based on observed 18O- 15N-isotopic shifts comparison similar compounds, cis–cis trans–perp HOONO. Ab initio calculations using...
Sodium nitrite dispersed in solid argon exhibited infrared absorption at 1293.0, 1222.8, and 825.6 cm−1, corresponding, respectively, to symmetric asymmetric stretching, bending, modes of the NO−2 moiety a bidentate planar cyclic structure C2v symmetry (designated cyclic-NaNO2). After irradiation matrix sample with emission from KrF laser 248 nm, new lines 1446.2, 1159.1, 787.1 cm−1 were recorded. A containing Na15NO2 absorbed 1272.1, 1198.2, 821.7 before irradiation; 1419.6, 1136.9, 782.8...
Irradiation of an Ar matrix sample containing O3 and CS2 with a KrF excimer laser at 248 nm yielded new lines 1402.1 (1404.7), 1056.2 (1052.7), 622.3 (620.5) cm−1; numbers in parentheses correspond to species minor site. Secondary photolysis 308 diminished these produced mainly OCS SO2. Annealing this 30 K second set 1824.7 617.8 cm−1. The first are assigned C=S stretching, O–S S–C stretching modes carbon disulfide S-oxide, OSCS; the C=O bending dithiiranone, O(CS2), respectively, based on...
We determined the threshold for photodissociation of H2O to form OH in matrices by dissociating a matrix sample situ on scanning energy synchrotron radiation and detecting increase intensity laser-induced fluorescence OH. The derived threshold, 6.89±0.04 eV solid Ar, is almost identical previously reported value 6.9±0.04 eV. Ne, 6.87±0.02 eV, within experimental uncertainty that Ar. They are recently absorption Ne Hence, near from ground X̃ state repulsive à state. thresholds correspond...
Irradiation of an Ar matrix sample containing H2S and CO (or OCS) with ArF excimer laser at 193 nm yields trans-HSCO (denoted t-HSCO). New lines 1823.3, 931.6, 553.3 cm−1 appear after photolysis their intensity enhances annealing; secondary 248 diminishes these produces OCS CO. These are assigned to C–O stretching, HSC-bending, C–S stretching modes t-HSCO, respectively, based on results C13-isotopic experiments theoretical calculations. Theoretical calculations using density-functional...
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