Seeing atoms : the scanning tunneling microscope at UPEI

Contributors
Creator: Dahn, Douglas
Date Recorded
1990-11-30
Date Digitized
2023
Genre
Event
Rights
All content on this site is made available for personal research and private study only. Any other reuse, reproduction, or re-purposing may require the permission of the rightsholder(s); please contact the UPEI Library for more information on permissions/clearances.
Physical Location
Original cassette held by UPEI Archives and Special Collections
Duration
01:14:48
Member of
UPEI Archives Audio Collection
Model
1 1 Item in Collection
Transcript
00:00 Introduction

01:30 Brief outline of seminar; description of a scanning tunnelling microscope

04:00 Description of how scanning tunnelling microscopes work; discussion of how electrons function in relation to quantum mechanics

06:30 Description of the tunnelling function of a scanning tunnelling microscope

08:30 Discussion of the history of scanning tunnelling microscopes

10:00 Discussion of Dalhousie's scanning tunnelling microscope program

11:00 Discussion of graphite; atomic structures

13:30 Discussion of Rohrer; 1986 establishment of scanning tunnelling microscope at Dalhousie

15:00 Further discussion of the mechanisms of a scanning tunnelling microscope

22:30 Discussion of improvements to software related to scanning tunnelling microscopes

23:00 Further discussion of the mechanisms of a scanning tunnelling microscope

24:00 Discussion of the benefits of tunnelling microscopy

27:00 Discussion of drawbacks of tunnelling microscopy

28:00 Further discussion of the mechanisms of scanning tunnelling microscopes

31:00 Discussion of microscopic images of silicon produced by IBM

33:00 Comparison of images produced by various microscopes

34:00 Discussion of utilising scanning tunnelling microscopes on biological samples

36:00 Discussion of microscopic imaging of DNA

39:00 Discussion of utilising graphite in microscopy

41:00 Discussion of the quality of DNA images

43:00 Discussion of work in Halifax on microscopic imaging on biological material

46:00 Discussion of difficulties with microscopy with regards to biological material

47:00 Brief gap in audio

48:00 Resumption of audio

51:00 Discussion of UPEI's attempt to investigate ribosomes

58:00 Conclusion of the lecture, future of scanning tunnelling microscopy

01:02:00 Question period; question regarding microscopic images of graphite and benzene

01:04:00 Question regarding bandwidth of scanning; question regarding graphite

01:06:00 Question regarding methodology of research

01:07:00 Question regarding field-of-view for microscopic imaging

01:08:00 Question regarding DNA imaging

01:11:00 Question regarding graphite as a substrate, potential replacement in mica, other alternative substrates