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Nitrogen Cluster Anions
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DOI：10.1021/acs.jpcc.6b09211.png)
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摘要
En 中文
Anions are formed by electron attachment to helium nanodroplets doped with N-2. The most prominent ion series is due to odd-numbered N-m(-) with 3 <= m < 140. Neither N- nor N-2(-) are observed. An appearance energy of 11.5 +/- 0.5 eV is measured for N-3(-). The yield of N-m(-) averaged over 5 <= m <= 21 shows an appearance energy of 9 eV, just above the estimated thermodynamic threshold for formation of N-3(-) from electron attachment to small N-2 clusters embedded in helium droplets. These findings support the notion that odd numbered N-m(-) cluster ions are best characterized as N-2 van der Waals clusters with an azide anion chromophore, but they are at odds with some theoretical reports. N-3(-)(N-2)(4) and N-3(-)(N-2)(11) form local maxima in the abundance distribution, suggesting that these ions are particularly stable. The yield of even numbered N-m(-) ions (m >= 4) is 2 orders of magnitude lower, barely exceeding the background level. Several other cluster anion series are observed that involve impurities.
Keyword:
LASER-DESORPTION IONIZATION
ELECTRON-ATTACHMENT
ION
N-2
MOLECULES
DYNAMICS
HELIUM
DECOMPOSITION
ABLATION
NITRIDE
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期刊
IF:
3.2
论文数:
5.6W
被引数:
15.0W
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