Positron annihilation lifetimes in irradiated crystalline quartz versus the 'glassy' thermal conductivity

Laermans, C.; Mbungu-Tsumbu,; Segers, D.; Dorikens, M.; Dorikens‐Vanpraet, L.; Bosch, A. Van den; Cornelis, J.

doi:10.1088/0022-3719/17/4/017

Cited by 5 publications

(1 citation statement)

References 13 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Fused quartz glass samples have been investigated with various positron annihilation spectroscopies (PAS) by a number of researchers [17][18][19], and various positron interactions with crystalline quartz have been reported [14,20,21], but no studies have been published regarding enantiomeric pairs of crystalline quartz.…”

Section: Introductionmentioning

confidence: 99%

Asymmetric Positron Interactions with Chiral Quartz Crystals?

Horn

Corsiglia

et al. 2017

DDF

View full text Add to dashboard Cite

We have studied the interaction of the positron with chiral left-or right-handed quartz crystals. In Doppler-broadening experiments, using a mono-energetic positron beam there is a differential depth profile for positrons implanted in LH or RH z-cut quartz as identified by a shape parameter (S). Further, in bulk positron annihilation lifetime spectroscopy (PALS) experiments, the lifetime (τ 2) attributed to free annihilation of the positron interacting with the chiral lattice exhibits a larger value for the LH quartz, and the associated intensity (I2) is also significantly different—RH quartz is consistently 10% greater than the LH crystal. The τ3 lifetime and its intensity, I3, attributed to positronium interacting with defects in the quartz, also appears to exhibit differences between the enantiomeric sets of crystals. These observations may demonstrate chiral recognition using a positron annihilation technique, pave the way for a broad range of positron experiments, and may help inform hypotheses of chirality recognition, selection, or induction by beta radiation.

show abstract

Section: Introductionmentioning

confidence: 99%

Asymmetric Positron Interactions with Chiral Quartz Crystals?

Horn

Corsiglia

et al. 2017

DDF

View full text Add to dashboard Cite

show abstract

Investigation of the “Glassy” Properties of Neutron and Electron Irradiated Crystalline Quartz Related to the Anomalous Low Temperature Dynamics of Non-Crystalline Solids

Laermans¹

1986

Structure and Bonding in Noncrystalline Solids

View full text Add to dashboard Cite

Ultrasonic attenuation easurements and “glassy” behaviour of neutron irradiated quartz

1986

View full text Add to dashboard Cite

The ultrasonic attenuation of longitudinal acoustic waves in slightly disordered crystalline quartz has been measured over a temperature range from 1.3 to 300 K, using the pulse-echo technique. Neutron irradiation is demonstrated to increase the ultrasonic attenuation at low temperatures indicating the presence of two-level tunneling systems similar to those of glasses. Our low-temperature acoustic results agree with a frequency independence and a T 3 behaviour for the relaxation process predicted by the two-level tunneling TLS-model where the regime wT, % 1 holds.

show abstract

Positron annihilation lifetimes in irradiated crystalline quartz versus the 'glassy' thermal conductivity

Cited by 5 publications

References 13 publications

Asymmetric Positron Interactions with Chiral Quartz Crystals?

Asymmetric Positron Interactions with Chiral Quartz Crystals?

Investigation of the “Glassy” Properties of Neutron and Electron Irradiated Crystalline Quartz Related to the Anomalous Low Temperature Dynamics of Non-Crystalline Solids

Ultrasonic attenuation easurements and “glassy” behaviour of neutron irradiated quartz

Contact Info

Product

Resources

About