Pressure Broadening of the Potassium Resonance Lines by Argon and Nitrogen

Hull, G. F.

doi:10.1103/physrev.50.1148

Cited by 19 publications

(5 citation statements)

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“…However, his research was limited to relatively low densities and pressures 10 , 11 . Later experiments showed this relationship held more generally for alkali metals and a variety of different gaseous perturbers at increased densities 12 , 13 , though in absolute terms the pressures investigated were still relatively modest; of order 10 MPa. A linear dependence is also anticipated by Lindholm-Foley collision theory, shown to be 14 , 15 : …”

Section: Introductionmentioning

confidence: 89%

Pressure and temperature induced red-shift of the sodium D-line during HMX deflagration

Morley

Williamson

2020

Commun Chem

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The sodium D-line is often present in optical spectra of combustion due to its high prevalence and emissivity. Collision theory predicts the spectral peak to have a red-shift dependent on pressure, P, and temperature, T. Here we show that the conditions reached during deflagration of octahydro-1,3,5,7-tetranitro-1,3,5,7-tetrazocine (HMX) permit the red-shift of the sodium D-line to be calibrated to 1.5 GPa. Deflagration at these pressures is achieved using a split Hopkinson pressure bar apparatus, with temperatures of circa 2900 K from the greybody continuum away from spectral features. Lower deflagration pressures, of 0.5 to 0.9 GPa, are achieved in a fallhammer test, with temperatures of circa 4000 K. The red-shift exhibits the predicted PT −0.7 dependence with a constant of proportionality of (950 ± 30) GPa -1 · K 0.7 · nm. Using the serendipitous presence of sodium, this optical technique allows for fast measurements of both pressure and temperature from the same light source in one measurement.

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Section: Introductionmentioning

confidence: 89%

Pressure and temperature induced red-shift of the sodium D-line during HMX deflagration

Morley

Williamson

2020

Commun Chem

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“…a permis de mettre en évidence un déplacement et un élargissement plus rapides que s'ils obéissaient à une loi linéaire en fonction de d. Cette étude a été reprise avec plus de précision pour les raies de résonance perturbées par A et N2 [57,58] et à basse pression par la vapeur de Rb [14]. 2).…”

Section: Fig 3 -Raies D Deunclassified

“…e) FORME DES PROFILS. -Quelques auteurs ont mesuré la forme des profils des raies spectrales pour diverses densités des gaz perturbateurs dans le but de les comparer aux profils théoriques ou de mettre en évidence les asymétries (par exemple [10,33,37,57,72,98,127] ; d'autres ont étudié plus particulièrement la répartition des intensités sur les flancs de la raie loin du centre (par exemple [76,103,131]. f ) VARIATIONS D'INTENSITÉ.…”

Section: Tableauunclassified

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Perturbations par la pression des raies spectrales dans les spectres atomiques pour des particules électriquement neutres

Robin¹,

Robin²

1956

J. Phys. Radium

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Sommaire. Après un court rappel des méthodes et de l'appareillage utilisé, on donne les résultats de l'étude expérimentale des perturbations des raies spectrales d'absorption (raies de résonance du mercure et des métaux alcalins, deuxièmes doublets de la série principale des métaux alcalins, etc...) tant par des molécules étrangères, à basse et haute pression, que par les atomes du métal eux-mêmes. Les diverses théories des phénomènes constatés (théories des chocs, théories statistiques, mécanique ondulatoire) sont ensuite indiquées. Les deux paragraphes suivants traitent des perturbations des spectres d'émission et des bandes induites par la pression. La conclusion fait ressortir l'importance théorique et pratique du problème des perturbations.

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“…The laser is tuned to the D1 line (769.9 nm), and the laser linewidth, together with the effects of pressure broadening [6], ensures that all of the K isotopes considered in this experiment are optically pumped. At the cell there is an estimated 2.5 W of laser power available for optical pumping.…”

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confidence: 99%

Laser orientedK36for time reversal symmetry measurements

et al. 1995

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We have produced very large nuclear alignments in radioactive K (half-life 0.34 sec) through laser optical pumping techniques. The K was created through (p, n) reactions using a 50 nA, 22 MeV proton beam, and a 3.3 atmosphere Ar target. Measurements were made with the target cell at room temperature, when direct optical pumping produces nuclear orientation in the K, and at elevated temperatures 160 C and 180 'C) where the K is oriented through a combination of direct optical pumping and spin exchange. The fraction of the maximal nuclear alignment for the 180 'C data was determined to be 0.46~0.07 stat~0. 05 syst through measurements of the y-ray anisotropy following positron decay. Roughly 10 or more decays of oriented K occurred each second. The application of the superallowed decay of K to measurements of time-reversal symmetry in P decay is discussed.

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Pressure Broadening of the Potassium Resonance Lines by Argon and Nitrogen

Cited by 19 publications

References 5 publications

Pressure and temperature induced red-shift of the sodium D-line during HMX deflagration

Pressure and temperature induced red-shift of the sodium D-line during HMX deflagration

Perturbations par la pression des raies spectrales dans les spectres atomiques pour des particules électriquement neutres

Laser orientedK36for time reversal symmetry measurements

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