期刊
JOURNAL OF PHYSICAL CHEMISTRY A
卷 115, 期 34, 页码 9682-9688出版社
AMER CHEMICAL SOC
DOI: 10.1021/jp201125k
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资金
- NSF [CHE 0809093]
- Direct For Mathematical & Physical Scien
- Division Of Chemistry [1112391] Funding Source: National Science Foundation
Single water molecules have been isolated in solid Ar matrices at 4 K and studied by rovibrational spectroscopy using FTIR in the regions of the v(1), v(2), and v(3) modes. Upon nuclear spin conversion at 4K, essentially pure para-H2O was prepared, followed by subsequent fast annealing generating ice particles. FTIR studies of the vapor above the condensed water upon annealing to T >= 250 K indicate fast reconversion of nuclear spin to equilibrium conditions. Our results indicate that nuclear spin conversion is fast in water dimers and larger clusters, which preclude preparation of concentrated samples of para-H2O, such as in ice or vapor.
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