Fragmentation of Methanol Molecules after Core Excitation and Core Ionization Studied by Negative-Ion/Positive-Ion Coincidence Experiments,The Journal of Physical Chemistry A

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Fragmentation of Methanol Molecules after Core Excitation and Core Ionization Studied by Negative-Ion/Positive-Ion Coincidence Experiments
The Journal of Physical Chemistry A ( IF 2.7 ) Pub Date : 2017-12-28 00:00:00 , DOI: 10.1021/acs.jpca.7b11250
Antti Kivimäki _{1,

2} , Christian Stråhlman _{2,

3} , Robert Richter ₄ , Rami Sankari ₂

Affiliation

We have studied the fragmentation of the methanol molecule after core excitation and core ionization by observing coincidences between negative and positive ions. Five different negative ions (H^–, C^–, CH^–, O^–, and OH^–) were observed at both the C 1s and O 1s edges. As negative ion formation occurs after resonant and normal Auger decay of core–hole states, it is necessarily linked with the release of positively charged fragments. Our data show that such fragmentation can happen in many different ways: We found approximately 30 negative-ion/positive-ion/positive-ion coincidence (NIPIPICO) channels. All involve only singly charged positive ions. Fragmentation channels leading to atomic ions are the most probable, but positive molecular ions are also frequently found in the context of anion formation. Coincidence yields as a function of photon energy were determined for the most intense NIPIPICO channels. Adding together the data measured at different photon energies, we could also verify the occurrence of four-ion coincidences, which involved one negative ion (H^– or O^–) and three positive ions.

中文翻译：

负离子/正离子重合实验研究核激发和核电离后甲醇分子的碎裂

我们通过观察负离子与正离子之间的巧合，研究了核激发和核电离后甲醇分子的碎裂现象。五个不同的负离子（H ^-，C ^-，CH ^-，O- ^-和OH ^-）在C 1s和O 1s边缘都观察到。由于在核孔态共振和正常俄歇衰变之后发生负离子形成，因此它必然与带正电荷的碎片的释放有关。我们的数据表明，这种碎片可能以多种不同的方式发生：我们发现了大约30个负离子/正离子/正离子重合（NIPIPICO）通道。所有都只包含单电荷的正离子。导致原子离子分裂的通道最可能，但在阴离子形成的背景下也经常发现正分子离子。确定了最强烈的NIPIPICO通道的重合产量与光子能量的关系。将在不同光子能量下测得的数据加在一起，我们还可以验证四离子巧合的发生，其中涉及一个负离子（H^–或O ^–）和三个阳离子。

更新日期：2017-12-28

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