Depth profiling analysis of solar wind helium collected in diamond-like carbon film from Genesis
- Hokkaido Univ., Sapporo (Japan)
- Los Alamos National Lab. (LANL), Los Alamos, NM (United States)
- Arizona State Univ., Tempe, AZ (United States)
- California Inst. of Technology (CalTech), Pasadena, CA (United States)
- National Institute for Materials Science, Ibaraki (Japan)
- JEOL Ltd., Tokyo (Japan)
- Osaka Univ., Osaka (Japan)
- Kyushu Univ., Fukuoka (Japan)
- Institute for Isotope Geology and Mineral Resources, Zurich (Switzerland)
The distribution of solar-wind ions in Genesis mission collectors, as determined by depth profiling analysis, constrains the physics of ion solid interactions involving the solar wind. Thus, they provide an experimental basis for revealing ancient solar activities represented by solar-wind implants in natural samples. We measured the first depth profile of ⁴He in a collector; the shallow implantation (peaking at <20 nm) required us to use sputtered neutral mass spectrometry with post-photoionization by a strong field. The solar wind He fluence calculated using depth profiling is ~8.5 x 10¹⁴ cm⁻². The shape of the solar wind ⁴He depth profile is consistent with TRIM simulations using the observed ⁴He velocity distribution during the Genesis mission. It is therefore likely that all solar-wind elements heavier than H are completely intact in this Genesis collector and, consequently, the solar particle energy distributions for each element can be calculated from their depth profiles. Ancient solar activities and space weathering of solar system objects could be quantitatively reproduced by solar particle implantation profiles.
- Research Organization:
- Los Alamos National Lab. (LANL), Los Alamos, NM (United States)
- Sponsoring Organization:
- USDOE
- Grant/Contract Number:
- AC52-06NA25396
- OSTI ID:
- 1221389
- Report Number(s):
- LA-UR-15-21508
- Journal Information:
- Geochemical Journal, Vol. 49, Issue 5; ISSN 0016-7002
- Publisher:
- Geochemical Society of JapanCopyright Statement
- Country of Publication:
- United States
- Language:
- English
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