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Gas-phase production and photoelectron spectroscopy of the smallest fullerene, C20

Fullerenes are graphitic cage structures incorporating exactly twelve pentagons.

The smallest possible fullerene is thus C20,which consists solely of pentagons.

But the extreme curvature and reactivity of this structure have led to doubts about its existence and stability.

Although theoretical calculations have identified,besides this cage,

a bowl and a monocyclic ring isomer as lowenergy members of the

C20 cluster family, only ring isomers of C20 have been observed so far.

Here we show that the cage-structured fullerene C20 can be produced from its perhydrogenated form (dodecahedrane C20H20) by replacing the hydrogen atoms with relatively weakly bound bromine atoms, followed by gasphase debromination.

For comparison we have also produced the bowl isomer of C20 using the same procedure.

We characterize the generated C20 clusters using mass-selective anion photoelectron spectroscopy; the observed electron affinities and

vibrational structures of these two C20 isomers differ significantly from each other, as well as from those of the known monocyclic isomer.

We expect that these unique C20 species will serve as a benchmark

test for further theoretical studies.

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    Gas-phase production and photoelectron spectroscopy of the smallest fullerene, C20

    最小富勒烯 (fullerene) C20 的氣相生產與光電子光譜學 。

    Fullerenes are graphitic cage structures incorporating exactly twelve pentagons. The smallest possible fullerene is thus C20,which consists solely of pentagons.

    富勒烯確切包括十二個五邊形的石墨籠狀結構。因此有可能最小的富勒C20 係單獨由五邊形所組成。

    But the extreme curvature and reactivity of this structure have led to doubts about its existence and stability.

    但此結構的極端曲度與反應性導致對其存在與穩定的疑義。

    Although theoretical calculations have identified, besides this cage, a bowl and a monocyclic ring isomer as low energy members of the C20 cluster family, only ring isomers of C20 have been observed so far.

    雖然理論演算已確認,除此籠狀體外,一個碗狀與一個單輪碳環同分異構體作為C20群族的低能源的一份子。到目前為止僅有C20碳環同分異構物異構體被觀察過。

    Here we show that the cage-structured fullerene C20 can be produced from its per hydrogenated form (dodecahedrane C20H20) by replacing the hydrogen atoms with relatively weakly bound bromine atoms, followed by gasphase debromination. For comparison we have also produced the bowl isomer of C20 using the same procedure.

    在此我們表明籠狀結構的富勒烯(fullerene) C20 可由它的氫化形式(十二面體 C20H20 ) 藉由使用相對微弱結合的溴原子來替換氫原子,隨後再經由氣相進行溴化物分解而產生。為了比較,我們使用相同程序也生產了C20 的碗狀同分異構體。

    We characterize the generated C20 clusters using mass-selective anion photoelectron spectroscopy; the observed electron affinities and vibrational structures of these two C20 isomers differ significantly from each other, as well as from those of the known monocyclic isomer.

    我們使用大量有選擇性的陰離子光電子光譜學來描述所產生的 C20 群組,被觀察到的此兩個 C20 同分異構體其電子相似性與振動結構彼此顯著不同,而那些已知的單輪同分異構體也不同。

    We expect that these unique C20 species will serve as a benchmark test for further theoretical studies.

    我們期待這些獨特的C20 種類將作為進一步理論研究的標竿試驗。

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