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@article{1379011, author = {Navrátil, Zdeněk and Morávek, Tomáš and Ráheľ, Jozef and Čech, Jan and Lalinský, Ondřej and Trunec, David}, article_location = {Bristol, England}, article_number = {5}, doi = {http://dx.doi.org/10.1088/1361-6595/aa66b5}, keywords = {dielectric barrier discharge; helium; single photon counting; bremsstrahlung; electric}, language = {eng}, issn = {0963-0252}, journal = {Plasma Sources Science and Technology}, title = {Diagnostics of pre-breakdown light emission in a helium coplanar barrier discharge: the presence of neutral bremsstrahlung}, url = {http://iopscience.iop.org/article/10.1088/1361-6595/aa66b5}, volume = {26}, year = {2017} }
TY - JOUR ID - 1379011 AU - Navrátil, Zdeněk - Morávek, Tomáš - Ráheľ, Jozef - Čech, Jan - Lalinský, Ondřej - Trunec, David PY - 2017 TI - Diagnostics of pre-breakdown light emission in a helium coplanar barrier discharge: the presence of neutral bremsstrahlung JF - Plasma Sources Science and Technology VL - 26 IS - 5 SP - nestránkováno EP - nestránkováno PB - IOP PUBLISHING LTD SN - 09630252 KW - dielectric barrier discharge KW - helium KW - single photon counting KW - bremsstrahlung KW - electric UR - http://iopscience.iop.org/article/10.1088/1361-6595/aa66b5 L2 - http://iopscience.iop.org/article/10.1088/1361-6595/aa66b5 N2 - Weak light emission (~10-3 of active discharge signal; average count rate ~ 1 photon s-1 nm-1) associated with surface charge relaxation during the dark phase of a helium diffuse coplanar barrier discharge was studied by optical emission spectroscopy, using a technique of phase-resolved single photon counting. The optical emission spectra of the dark phase contained luminescent bands of the dielectrics used (Al2O3, AlN) and spectral lines from the gas constituents (OH*, N2*, N2+*, He*, He2*, O*). During the charge relaxation event, a broad continuum appeared in the optical emission spectra, consisting of bremsstrahlung radiation and amplified luminescence of the dielectric barrier. The analysis presented suggests that the bremsstrahlung radiation originated from slow electrons colliding with neutral helium atoms. The fitting procedure we developed reproduced well the observed shape of the continuum. Moreover, it provided a method for the determination of electric field strength in the discharge during this particular phase. The electric field reached 1 kV cm-1 during the charge relaxation event. ER -
NAVRÁTIL, Zdeněk, Tomáš MORÁVEK, Jozef RÁHEĽ, Jan ČECH, Ondřej LALINSKÝ a David TRUNEC. Diagnostics of pre-breakdown light emission in a helium coplanar barrier discharge: the presence of neutral bremsstrahlung. \textit{Plasma Sources Science and Technology}. Bristol, England: IOP PUBLISHING LTD, 2017, roč.~26, č.~5, s.~nestránkováno, 10 s. ISSN~0963-0252. Dostupné z: https://dx.doi.org/10.1088/1361-6595/aa66b5.
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