Nuclear acoustic resonance in palladium metal

Ströbel, B.; Müller, V.; Schilling, D.; Läuger, K.; Bömmel, H. E.

doi:10.1088/0305-4608/9/12/003

Cited by 4 publications

(5 citation statements)

References 7 publications

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“…3). This is to be compared with our upper boundary of 2000 km where the N 2 density is only 7 × 10 4 cm −3 (Strobel 2012) and the production of atmospheric recoils at higher altitudes is negligible.…”

Section: Discussionmentioning

confidence: 83%

“…A test particle Monte Carlo model was constructed to simulate the energy degradation of incident ions and atmospheric recoils in Titan's atmosphere. The background atmosphere, assumed to be plane parallel, was adopted from Strobel (2012) over the altitude range of 880-2000 km above Titan's surface. The most abundant species of Titan's atmosphere is N 2 , which has a mixing ratio of more than 98% at 880 km, but CH 4 becomes increasingly important due to diffusive separation, starting to dominate over N 2 at around 1800 km.…”

Section: Model Descriptionmentioning

confidence: 99%

“…Throughout our calculations, the effect of the background magnetic field, typically at the level of several nT (e.g., Backes et al 2005;Bertucci et al 2008Bertucci et al , 2009, is ignored for simplicity since the gyroradii of the incident ions could be estimated to exceed substantially their mean free paths due to elastic scattering by ambient neutrals. Taking incident CH + 4 as an example, the mean free path ranges from 110 to 6500 km over the full incidence energy range of 10 to 100 keV, where we use for illustrative purposes a background N 2 density of 1.7 × 10 7 cm −3 at 1500 km (Strobel 2012). For comparison, the CH + 4 gyroradius is typically a factor of 5 larger, suggesting that the effect of ion gyromotion is of minor importance here.…”

Section: Model Descriptionmentioning

confidence: 99%

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Monte Carlo calculations of the atmospheric sputtering yields on Titan

Cui

Niu

Wellbrock

et al. 2019

A&A

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Context. Sputtering serves as an important mechanism of atmospheric escape in the solar system. Aims. This study is devoted to atmospheric sputtering on Titan, with a special focus on how the N 2 and CH 4 sputtering yields respond to varying ion incidence energy and angle, and varying ion mass. Methods. A Monte Carlo model was constructed to track the energy degradation of incident ions and atmospheric recoils from which the sputtering yields were obtained. A large number of model runs were performed, taking into account three categories of incident ion with representative masses of 1, 16, and 28 Da, as well as two collision models both characterized by a strongly forward scattering angle distribution, but different in terms of the inclusion or exclusion of electronic excitation of ambient neutrals. Results. Our model calculations reveal substantial increases in both the N 2 and CH 4 sputtering yields with increasing ion incidence energy and angle, and increasing ion mass. The energy distribution of escaping molecules is described reasonably well by a power law, with an enhanced high energy tail for more energetic incident ions and less massive atmospheric recoils. The CH 4 -to-N 2 sputtering yield ratio is found to range from 10 to 20%, increasing with increasing incidence angle and also increasing with decreasing incidence energy. An approximate treatment of ion impact chemistry is also included in our model, predicting N 2 sputtering yields on Titan that are in broad agreement with previous results.

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Section: Discussionmentioning

confidence: 83%

Section: Model Descriptionmentioning

confidence: 99%

Section: Model Descriptionmentioning

confidence: 99%

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Monte Carlo calculations of the atmospheric sputtering yields on Titan

Cui

Niu

Wellbrock

et al. 2019

A&A

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“…The palladium single crystal we have used for the determination of was the same as for previous NAR Knight shift experiments [8]. This crystal was cut in such a way that the ultrasonic wave vector q was parallel to the [llO] diagonal, with its polarisation vector U parallel to the [OOl] direction while the crystal was oscillating at one of its natural frequencies.…”

Section: Methodsmentioning

confidence: 99%

“…When NAR was first observed in palladium [8], the lineshape exhibited an unusual asymmetry that was probably distorted in part by considerable overmodulation. To solve the question of the true lineshape, an NARZ line was registered using a very small modulation field (Hmod = 1.7 G).…”

Section: Nar Lineshapementioning

confidence: 99%

Nuclear acoustic resonance measurements of the temperature dependent dynamic electric field gradient V₄₄in palladium

Bartell¹,

Schilling²,

Bömmel³

1990

J. Phys.: Condens. Matter

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The authors report on the temperature dependence of the relative electron contribution r44 to the dynamic electric field gradient V44 in single-crystal palladium. For this, NAR2 lineshape data (NAR identical to nuclear acoustic resonance) are presented in the temperature range between 11 and 210 K. By extrapolation, the value of r44 at very low temperature is found to fit well the systematic dependence of r44 on N(EF) among the d transition metals.

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