The tesla discharge as a spectroscopic source for the study of excimer laser transitions

McKeever, Mark R.; Sur, Abha; Hui, A. K.; Tellinghuisen, Joel

doi:10.1063/1.1136001

Cited by 19 publications

(5 citation statements)

References 14 publications

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“…͑The Ar pressure was intentionally made much lower than the 600 Torr used in the 136 Xe 81 Br source, in the hope of obtaining measurable structure from Ј levels higher than those observed for 136 Xe 81 Br.͒ The source was made of 7 mm OD quartz tubing and was fabricated with a fused quartz window for end-on viewing. Emission intensities were comparable to those from the strongest such sources we have worked with in the past, 27 resulting in exposures as short as a few seconds in the most intense 2800 Å region, increasing to 10 min for highresolution recordings of emission from the highest Ј levels below 2600 Å. Atomic calibration spectra were obtained from microwave discharge Fe/I 2 lamps ͑exposures typically 20 s @5 m slit width͒; wavelengths were taken from Crosswhite.…”

Section: Methodsmentioning

confidence: 99%

The B(1/2 2P3/2)→X(1/2 2Σ+) transition in XeBr

Tellinghuisen

1995

The Journal of Chemical Physics

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The B(1/2 2P3/2)→X(1/2 2Σ+) transition in XeBr is recorded at high resolution, using a CCD array detector to record spectra from Tesla discharge sources containing isotopically pure 136Xe with 81Br2 or 79Br2. The high signal/noise capabilities of the detector permit the measurement of discrete vibrational structure in this system, which has normally been treated as a purely bound–free transition. The assignments comprise 119 υ′–υ″ bands for 136Xe81Br and 86 for 136Xe79Br, spanning υ′=0–33 and υ″=0–16. The van der Waals ground state is analyzed through fits to the customary polynomials in (υ+1/2) and to near-dissociation expansions. Franck–Condon calculations are used to locate the X-state potential on the internuclear axis relative to the B state, which is modeled as a Rittner potential. The following fundamental spectroscopic constants (units cm−1, for 136Xe81Br) are obtained from the analysis: Te′=35 863.2, ωe′=135.72, ωexe′=0.32, ωe″=25.7, ωexe″=0.62. The ground state has a dissociation energy 𝒟e″=254±2 cm−1 and supports 24 bound vibrational levels.

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Section: Methodsmentioning

confidence: 99%

The B(1/2 2P3/2)→X(1/2 2Σ+) transition in XeBr

Tellinghuisen

1995

The Journal of Chemical Physics

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“…or more for only short times (1-2 min) should result in minimal exposure, with or without safety glasses. The Tesla coil output is very high voltage (up to 50 kV) but also very high frequency, so the spark is not dangerous (22). Instructors can "wow" students by boldly taking a ∼0.5inch spark from the tip, though this is more comfortably done if the spark is directed to a coin held between thumb and forefinger.…”

Section: Hazardsmentioning

confidence: 99%

Laser-Induced Fluorescence in Gaseous I2 Excited with a Green Laser Pointer

Tellinghuisen

2007

J. Chem. Educ.

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The use of a green laser pointer to excite fluorescence in gaseous I2 results in an unexpected behavior: on transiting the cell, the beam alternately appears brightly and vanishes completely. This behavior is attributed to temporal changes in the laserâ€™s operating wavelength, likely due to temperature changes of the optical cavity as it warms up under power. As a result, the laser tunes itself into and out of resonance with the I2 absorption lines in the region of the laser gain profile. For this explanation to hold, it is also necessary that the laser operate with relatively high spectral purity, meaning a small number of narrow lasing modes. Spectra recorded for several different pointers display widely varying properties: some pointers operate on a single mode much of the time, while others emit in many weak lines in addition to one or two strong ones. Green laser pointers and an Ar-ion laser are used together to excite gaseous I2, illustrating in a comprehensive way the conditions necessary for laser-induced fluorescence in a gas. Spectra are observed with a hand spectroscope and photographed through the spectroscope with a digital camera. Complementary spectral phenomena are illustrated by exciting I2 with a Tesla discharge. Most of the information is best appreciated photographically, to which end a PowerPoint illustration is provided in the Supplemental Material.

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“…High-pressure Tesla discharges of halogens in inert buffer gases are characterized by near-Boltzmann distributions of emitting levels and states at temperatures not much above ambient (11,12). Accordingly, while the DЈ 3 AЈ system dominates the emission, 2 other electronic transitions are readily observed when they are spectrally removed from DЈ 3 AЈ (13,14).…”

Section: Introductionmentioning

confidence: 97%