[MOS] November 17, 2009

[Zina Queen]

Seminar on

Modern Optics and Spectroscopy

The quest for chemical contrasts in high resolution microscopy


Christian Degen, MIT

Tuesday, November 17, 2009


12:00 - 1:00 p.m.


Adding chemical contrast to the topographic capabilities of scanning 
probe microscopy is a longstanding aspiration, dating back to the 
early proposals of the technique by Binnig and Rohrer in 1982. This 
goal has led to great interest in combining scanning probes with 
spectroscopic techniques such as inelastic tunneling spectroscopy, 
force spectroscopy, or Raman spectroscopy, all of which have 
successfully demonstrated atomic or molecular identification in 
certain systems. In general, however, scanning probe microscopes are 
not particularly well-equipped to identify what they are actually 
imaging.

In this talk I will discuss our lab's efforts in combining scanning 
probe microscopy with the inherent chemical selectivity of nuclear 
magnetic resonance (NMR). I will introduce the basics of Magnetic 
Resonance Force Microscopy, and show how the technique can be used to 
detect different chemical elements. I will then talk about recent 
efforts at imaging nanoscale objects in 3D, including magnetic 
resonance imaging (MRI) of individual virus particles at a spatial 
resolution of better than 10 nm. Finally I will review the recent 
proposal of optical diamond magnetometry as an alternative path to 
nanometer-scale NMR under ambient conditions.


Grier Room, MIT Bldg 34-401
Refreshments served after the lecture
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