Abstract
Laboratoire pour l’Utilisation du Rayonnement Electromagne ´tique (LURE), Bat. 209D, Universite Paris-Sud, F-91405 Orsay, France~Received 28 September 2001; revised manuscript received 13 December 2001; published 30 August 2002!Cesium adsorbs on the InAs~110! surface in the form of long chains extending for several hundreds ang-stroms along the @11I0# direction, leading to a (23n) periodicity, with n depending on the mean distancebetween the alkali chains. We have investigated the evolution of the (23n) superstructure as a function ofcoverage and the statistical distribution of the Cs chains by means of grazing-incidence x-ray diffraction andlow-energy electron diffraction. The atomic geometry has been fully determined: each Cs chain is constitutedby two Cs adatoms with different adsorption sites. The minimum Cs-Cs distance within the chain is 6.9 A,much larger than the Cs-Cs bond length in bcc bulk metallic Cs.DOI: 10.1103/PhysRevB.66.085335 PACS number~s!: 68.43.Hn, 61.10.2i, 68.65.2kI. INTRODUCTION
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