STRUCTURAL INVESTIGATION OF GASEOUS, LIQUID, AND SOLID BR-2 BY X-RAY-ABSORPTION

被引:22
作者
FILIPPONI, A
OTTAVIANO, L
PASSACANTANDO, M
PICOZZI, P
SANTUCCI, S
机构
[1] Dipartimento di Fisica, Università degli Studi dell'Aquila, 67010 Coppito, L'Aquila, Via Vetoio
来源
PHYSICAL REVIEW E | 1993年 / 48卷 / 06期
关键词
D O I
10.1103/PhysRevE.48.4575
中图分类号
O35 [流体力学]; O53 [等离子体物理学];
学科分类号
070204 ; 080103 ; 080704 ;
摘要
Br K-edge x-ray-absorption measurements have been performed on gaseous (300 K), liquid (294 and 278 K), and solid (200 and 80 K) Br-2. The experimental data have been analyzed by using a comparison with calculated ab initio structural signals. The molecular Br-Br average distance, determined with the accuracy of 0.003 Angstrom A, shows an expansion of about 0.02 Angstrom A going from the gas phase to the low-temperature condensed phases. The bond-distance variance is found to be 2.0 x 10(-3) Angstrom A in the gas and liquid phases. The intermolecular contribution in the condensed phases, which is found to affect considerably the near-edge region fo the spectrum kappa < 3.5 Angstrom A(-1), has been isolated by means of a subtraction procedure. Significant differences between the liquid samples at the two temperatures are observed and the potential of these measurements to provide information on orientational correlations between neighboring molecules is addressed.
引用
收藏
页码:4575 / 4583
页数:9
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