X-ray induced mobility of molecular oxygen at extreme conditions

Journal Article · Tue Nov 26 00:00:00 EST 2013 · Applied Physics Letters

DOI:https://doi.org/10.1063/1.4836475· OSTI ID:1332813

Pravica, Michael ^[1]; Popov, Dmitry ^[2]; Sinogeikin, Stanislav ^[2]; Sneed, Daniel ^[1]; Guardala, Griffin ^[1]; Smith, Quinlan ^[1]

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1. Univ. of Nevada, Las Vegas, NV (United States)
2. Carnegie Inst. of Washington, Argonne, IL (United States)

An in situ Raman study of KClO₄ irradiated with x-rays in a diamond anvil cell is reported. Decompn. via KClO₄ + hν → KCl + 2O₂ was monitored via the O₂ vibron at 2, 6, and 9 GPa. For all pressures, the vibron grew in intensity and then diminished after successive irradn. suggesting that O₂ was diffusing away from the irradiated region. The diffusion rate accelerated with pressure increase, indicating that the nonhydrostatic pressure gradient was likely driving mol. diffusion of O. At 9 GPa, the vibron bifurcated suggesting that O₂ exists as 2 forms: interstitial and bulk solid. As a result, this method can be used to study molecular diffusion under extreme conditions.

• Research Organization: Univ. of Nevada, Las Vegas, NV (United States)
• Sponsoring Organization: USDOE National Nuclear Security Administration (NNSA)
• Grant/Contract Number: NA0001982
• OSTI ID: 1332813
• Journal Information: Applied Physics Letters, Vol. 103, Issue 22; ISSN 0003-6951
• Publisher: American Institute of Physics (AIP)
• Country of Publication: United States
• Language: English

Related Subjects

75 CONDENSED MATTER PHYSICS
SUPERCONDUCTIVITY AND SUPERFLUIDITY
38 RADIATION CHEMISTRY, RADIOCHEMISTRY, AND NUCLEAR CHEMISTRY
diffusion
high pressure
molecule irradiation effects
diamond anvil cells
hard x-rays