A field emission microscopic study of hydrogen adsorption on a stepped tungsten plane: W(310)

被引：3

作者：

Choi, DS ^{[1
]}

Paik, SM ^{[1
]}

Han, JH ^{[1
]}

Park, NG ^{[1
]}

Kim, KS ^{[1
]}

Whang, CN ^{[1
]}

机构：

[1] YONSEI UNIV,DEPT PHYS,SEOUL 120749,SOUTH KOREA

来源：

MODERN PHYSICS LETTERS B | 1997年 / 11卷 / 2-3期

关键词：

D O I：

10.1142/S0217984997000104

中图分类号：

O59 [应用物理学];

学科分类号：

摘要：

Using a newly developed Derivative Field Emission Current (DFEC) methods, the heat of desorption and the work-function-change of W(310) plane induced by hydrogen adsorption are measured. The average work function of the W(310) plane increases initially as the hydrogen dose increases for the low coverage region, decreases for the dose higher than about 0.7 Languimir, and saturates at about 4 Languimir. We find the eight hydrogen adsorption sites on the W(310) plane. Three of these sites are on the terrace (100) plane and the hydrogen adsorption on these sites lower the work function. The other three sites are on the step-wall (110) plane raising the work function. Last two sites are probably on the step-edge. The heats of desorption for these sites ranges from 16.6 +/- 2.0 kcal/mol for the gamma(2) state to 32.0 +/- 1.0 kcal/mol for the beta(6) state. An indirect comparison and analysis show that our findings are quite reasonable.

引用

页码：63 / 71

页数：9

共 27 条

[1] ADSORPTION ON SINGLE-CRYSTAL PLANES OF TUNGSTEN .1. NITROGEN [J].