Adsorbate enhancement of electron emission during the quenching of metastable CO at metal surfaces

被引：9

作者：

Engelhart, Daniel P. ^{[1
,2
]}

Wagner, Roman J. V. ^{[1
,2
]}

Johnsen, Peter C. ^{[3
]}

Wodtke, Alec M. ^{[1
,2
]}

Schaefer, Tim ^{[1
,2
]}

机构：

[1] Univ Gottingen, Inst Phys Chem, D-37077 Gottingen, Germany

[2] Max Planck Inst Biophys Chem, Dept Dynam Surfaces, D-37077 Gottingen, Germany

[3] Princeton Univ, Dept Phys, Princeton, NJ 08544 USA

来源：

PHYSICAL CHEMISTRY CHEMICAL PHYSICS | 2015年 / 17卷 / 17期

基金：

美国国家科学基金会;

关键词：

SHAPE RESONANCE; DEPENDENCE; ADSORPTION; COLLISIONS; CLUSTERS; XENON; ATOMS;

D O I：

10.1039/c5cp01255d

中图分类号：

O64 [物理化学（理论化学）、化学物理学];

学科分类号：

070304 ; 081704 ;

摘要：

When electronically excited CO(a(3)Pi) collides with a Au(111) surface, electron emission can be observed with a quantum efficiency of 0.13. We have studied the influence of Ar, Kr and Xe adsorption on the electron emission efficiency resulting from CO(a(3)Pi) quenching. Surprisingly, a single monolayer (ML) of rare gas dramatically enhances electron emission. For Ar and Kr bilayers, emission efficiency is further enhanced and approaches unity. The quenching mechanism involves electron transfer from the metal to the CO(a(3)Pi) molecule followed by electron emission from the molecule. The enhanced emission efficiency is due to the long range nature of the initial electron transfer process and the rare gas adlayer's ability to reflect the electron emitted by the transient CO anion. This work shows that CO(a(3)Pi) quenching is a useful model system for investigating the fate of electronically excited molecules at surfaces.

引用

页码：11540 / 11545

页数：6

共 24 条

[1] The adsorption sites of rare gases on metallic surfaces: a review [J].

Diehl, RD ;

Seyller, T ;

Caragiu, M ;

Leatherman, GS ;

Ferralis, N ;

Pussi, K ;

Kaukasoina, P ;

Lindroos, M .

JOURNAL OF PHYSICS-CONDENSED MATTER, 2004, 16 (29) :S2839-S2862

[2]

Engelhart D. P., 2015, REV SCI INS IN PRESS

[3] ELECTROCHEMICAL PHOTOLYSIS OF WATER AT A SEMICONDUCTOR ELECTRODE [J].

FUJISHIMA, A ;

HONDA, K .

NATURE, 1972, 238 (5358) :37-+

[4] The radiative lifetime of metastable CO (a 3Π, v=0) [J].

Gilijamse, Joop J. ;

Hoekstra, Steven ;

Meek, Samuel A. ;

Metsaelae, Markus ;

van de Meerakker, Sebastiaan Y. T. ;

Meijer, Gerard ;

Groenenboom, Gerrit C. .

JOURNAL OF CHEMICAL PHYSICS, 2007, 127 (22)

[5] CO (a3 Π) quenching at a metal surface: Evidence of an electron transfer mediated mechanism [J].

Graetz, Fabian ;

Engelhart, Daniel P. ;

Wagner, Roman J. V. ;

Meijer, Gerard ;

Wodtke, Alec M. ;

Schaefer, Tim .

JOURNAL OF CHEMICAL PHYSICS, 2014, 141 (04)

[6] Vibrational enhancement of electron emission in CO (a3Π) quenching at a clean metal surface [J].

Graetz, Fabian ;

Engelhart, Daniel P. ;

Wagner, Roman J. V. ;

Haak, Henrik ;

Meijer, Gerard ;

Wodtke, Alec M. ;

Schaefer, Tim .

PHYSICAL CHEMISTRY CHEMICAL PHYSICS, 2013, 15 (36) :14951-14955

[7] NEGATIVELY CHARGED XENON ATOMS AND CLUSTERS [J].

HABERLAND, H ;

KOLAR, T ;

REINERS, T .

PHYSICAL REVIEW LETTERS, 1989, 63 (12) :1219-1222

[8] A VERY LOW-ENERGY ELECTRON REFLECTION STUDY OF HYDROGEN ADSORPTION ON W(100) AND W(110) SURFACES [J].

HERLT, HJ ;

BAUER, E .

SURFACE SCIENCE, 1986, 175 (02) :336-368

[9] Can we control lifetimes of electronic states at surfaces by adsorbate resonances? [J].

Hotzel, A ;

Ishioka, K ;

Knoesel, E ;

Wolf, M ;

Ertl, G .

CHEMICAL PHYSICS LETTERS, 1998, 285 (3-4) :271-277

[10] Vibrational promotion of electron transfer [J].

Huang, YH ;

Rettner, CT ;

Auerbach, DJ ;

Wodtke, AM .

SCIENCE, 2000, 290 (5489) :111-114

← 1 2 3 →