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Structures and properties the lead-doped carbon clusters PbC_n/PbC_n~+/PbC_n~- (n=1-10)

机译:铅掺杂碳簇PbC_n / PbC_n〜+ / PbC_n〜-(n = 1-10)的结构与性能

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A systemic density functional theory study of thelead-doped carbon clusters PbC_n/PbC_n~+/PbC_n~- (n=1-10) has been carried out using B3LYP method with both CEP-31G and TZP+basis sets. For each species,the electronic states,realtive energies and geometries of various isomers are reported.According to these calculations, the Pb-terminated linear or quasilinear isomer is the msot stable structure for PbC_N/PbC_n~+/PbC_n~- clusters except for PbC_2/PbC-2~+ and PbC_(10)/PbC_(10)~+. Both PbC_2 and PbC_2~+ have bent ground state structure. For neutral PbC_(10),the Pb-side-on C_(10) monocyclic configuration has lowest energy. Except for the smallest PbC,PbC~+,and PbC~-,the electronic ground stateis alternate between ~3SUM (for n-odd member) and ~1SUM (for the n-even member) for PbC_n and invariably ~2II for linear PbC_n~+. The increemental binding energy diagrams show that strong even-odd alternations in the cluster stability exist for both neurtral PbC_n and anionic PbC_n and anionic PbC_n~-,with their n-even members being much more stable than the corresponding odd n-1 and n+1 ones,while for cationic PbC_n~+,the alternation effect is less pronounced. These parity effects also reflect in the ionization potential and electron affinity curves. Te even-odd alternation predicted by theoretical studies for anionic PbC_n~- is in good agrement with the even-odd alternation mass distribution observed in the time-of-flight mass spectra. By comparing with the fragmentation energies accompanying various channels,the most favorable dissociation channel for each kind of the PbC_n/PbC_n~+~- clusters are given.
机译:利用B3LYP方法对CeP-31G和TZP +基团进行了铅掺杂碳簇PbC_n / PbC_n〜+ / PbC_n〜-(n = 1-10)的系统密度泛函理论研究。对于每个物种,都报告了各种异构体的电子状态,能级和几何形状。根据这些计算,除PbC_2以外,PbC_N / PbC_n〜+ / PbC_n〜-团簇的Pb端为线性或准线性异构体。 / PbC-2〜+和PbC_(10)/ PbC_(10)〜+。 PbC_2和PbC_2〜+都具有弯曲的基态结构。对于中性PbC_(10),Pb侧面C_(10)单环构型的能量最低。除了最小的PbC,PbC〜+和PbC〜-以外,PbC_n的电子基态在〜3SUM(对于n个奇数成员)和〜1SUM(对于n个偶数成员)之间交替,对于线性PbC_n则恒定为〜2II 〜+。增量结合能图表明,中性PbC_n和阴离子PbC_n〜和阴离子PbC_n〜-均存在强的偶数奇偶性稳定性,其n-even元素比相应的奇数n-1和n +稳定得多。 1个,而对于阳离子PbC_n〜+,交替作用不太明显。这些奇偶效应还反映在电离势和电子亲和力曲线中。通过理论研究预测的阴离子PbC_n〜-的奇偶交替与飞行时间质谱图中观察到的奇偶交替质量分布高度吻合。通过与各种通道的碎裂能量的比较,给出了每种PbC_n / PbC_n〜+〜-团簇的最佳解离通道。

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