SSL/NUSNNI Seminar Series 2004 No.6

Combined talks (two speakers)

Date: November 5 (Friday), 2004
Time: 4:00-5:00pm
Venue: Physics Seminar Room (Blk S12 #04-10)

Speaker I: Ms.Wong Choun Pei
Title: STM Monitoring of Single Molecules

Abstract:
The ability to probe and understand matter at its most fundamental level is crucial to the field of nanoscience and nanotechnology. The Scanning Tunneling Microscope (STM) was initially used primarily to create nice pictures of surfaces. Later, the implementation of new modes of scanning also enabled other experiments, including chemical and spectroscopic measurements and manipulations to be carried out on single molecules. Indeed, the field of single-molecule monitoring using STM is very diverse. This project will look into the STM topographic and spectroscopic measurements of single molecules. Their principles, as well as some research work carried out in these aspects will be reviewed.

Speaker II: Mr.Toh Ping Yong
Title: X-ray Absorption Spectroscopy

Abstract:
X-ray absorption methods are used extensively to investigate the electronic and chemical structure of materials, and the various absorption techniques include Near Edge X-ray Absorption Fine Structure (NEXAFS) and Extended X-ray Absorption Fine Structure (EXAFS). These techniques utilise the absorption of x-rays by the atom and from the x-ray absorption spectrum, we are able to find out many details about the atoms and their neighbouring atoms.