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101.
M. Adamson A. Padmanabhan G.J. Godfrey S.J. Rehse 《Spectrochimica Acta Part B: Atomic Spectroscopy》2007,62(12):1348-1360
Single-pulse laser-induced breakdown spectroscopy has been performed on the surface of a bulk water sample in an air, argon, and nitrogen gas environment to investigate emissions from hydrogen-containing molecules. A microplasma was formed at the gas/liquid interface by focusing a Nd:YAG laser beam operating at 1064 nm onto the surface of an ultra-pure water sample. A broadband Echelle spectrometer with a time-gated intensified charge-coupled device was used to analyze the plasma at various delay times (1.0–40.0 μs) and for incident laser pulse energies ranging from 20–200 mJ. In this configuration, the dominant atomic spectral features at short delay times are the hydrogen H-alpha and H-beta emission lines at 656 and 486 nm, respectively, as well as emissions from atomic oxygen liberated from the water and air and nitrogen emission lines from the air bath gas. For delay times exceeding approximately 8 μs the emission from molecular species (particularly OH and NH) created after the ablation process dominates the spectrum. Molecular emissions are found to be much less sensitive to variations in pulse energy and exhibit a temporal decay an order of magnitude slower than the atomic emission. The dependence of both atomic hydrogen and OH emission on the bath gas above the surface of the water was studied by performing the experiment at standard pressure in an atmospheric purge box. Electron densities calculated from the Stark broadening of the H-beta and H-gamma lines and plasma excitation temperatures calculated from the ratio of H-beta to H-gamma emission were measured for ablation in the three bath gases. 相似文献
102.
Skwarnicki T Antreasyan D Besset D Bienlein JK Bloom ED Brock I Cabenda R Cartacci A Cavalli-Sforza M Clare R Conforto G Cooper S Cowan R Coyne D Edwards C Engler A Folger G Fridman A Gaiser J Gelphman D Godfrey G Heimlich FH Hofstadter R Irion J Jakubowski Z Keh S Kilian H Kirkbride I Kloiber T Koch W König AC Königsmann K Kraemer RW Lee R Leffler S Lekebusch R Litke AM Lockman W Lowe S Lurz B Marlow D Maschmann W Matsui T Messing F Metzger WJ Monteleoni B Nernst R Niczyporuk B Nowak G Peck C 《Physical review letters》1987,58(10):972-975
103.
R.D. Brown P.D. Godfrey A.L. Ottrey J.W.V. Storey 《Journal of Molecular Spectroscopy》1977,68(3):359-366
From high-resolution studies of the microwave spectrum of aminoacetonitrile we have established the quadrupole coupling constants of both nitrogen atoms in the molecule. They are χaa = ?2.77 (0.04) MHz, χbb = 1.20 (0.09) MHz for the amino nitrogen, χaa = ?3.48 (0.03) MHz, χbb = 1.50 (0.06) MHz for the nitrile nitrogen. Improved values for rotational constants and centrifugal distortion constants also emerge from the present spectral analysis. 相似文献
104.
105.
Aihara H Alston-Garnjost M Avery RE Barker AR Bauer DA Bay A Belcinski R Bingham HH Bloom ED Buchanan CD Caldwell DO Chao HY Chun SB Clark AR Cowan GD Crane DA Dahl OI Daoudi M Derby KA Eastman JJ Eberhard PH Edberg TK Eisner AM Erné FC Fairfield KH Fridman A Godfrey G Hauptman JM Ho C Hofmann W Kamae T Kenney RW Khacheryan S Kofler RR Lambert DJ Langeveld WG Layter JG Lin WT Linde FL Loken SC Lu A Lynch GR Lys JE Madaras RJ Magnuson BD Marsiske H Masek GE Mathis LG Maxfield SJ McNeil RR 《Physical review D: Particles and fields》1990,41(9):2667-2674
106.
107.
Bauer DA Belcinski R Berg RC Bingham HH Buchanan CD Caldwell DO Chun SB Clark AR Dahl OI Daoudi M Eastman JJ Eisner AM Fairfield KH Godfrey G Greenbaum GS Hauptman JM Hofmann W Holtzapple RL Khacheryan S Knöpfle KT Kofler RR Lambert DJ Layter JG Lin WT Loken SC Lu A Lynch GR Lys JE Madaras RJ Masek GE Miller ES Nicol NA Nygren DR Oyang JY Paar HP Palounek AP Pellett DE Ronan MT Ross RR Shapiro G Shen BC Stephens RW Stevenson ML Strauss MG Sullivan MK Vernon W Wang EM Wang YX Wenzel WA 《Physical review D: Particles and fields》1993,48(9):3976-3986
108.
Stephen Godfrey 《Zeitschrift fur Physik C Particles and Fields》1992,55(4):619-626
We present a detailed analysis of the processep→γ?X as a means of studying the gauge structure of theWWγ vertex. We find that the differential cross section of highp T photons offers a sensitive measure of anomalousWWγ couplings. At HERA \((\sqrt s = 314GeV)\) , after several years of running, theWWγ vertex can be measured to δκγ ? ?2.0 +2.9 and δλγ ? ?2.5 +3.0 (95% C.L.). Which offers an improvement over existing constraints from direct measurements using associatedWγ production in \(\bar pp\) collisions but is less sensitive than the competing process at HERA,ep→eWX. For a higher energyep collider, LEP-LHC \((\sqrt s = 1.3TeV)\) , theWWγ vertex can be measured to δδκγ ? ± 0.4 and δλκγ ? ± 0.1 at 95%C.L. which is more sensitive to λγ than the processe + e ?→W + W ? at the LEP200e + e ? collider and is comparable to the LEP200 sensitivity to κγ. These values are also roughly comparable to the competing processep→eWX at LEP-LHC and to what is expected from associated γW production at the LHC and SSC for κγ but they are about half as sensitive to λγ as the LHC and SSC. 相似文献
109.
110.