pizza talk 2006

Information about pizza talk 2006

Published on September 12, 2007

Author: Altoro

Source: authorstream.com

Content

FIM/AFM/STM updateTill Hagedorn:  FIM/AFM/STM update Till Hagedorn Pizza Talk Nov 15th, 2006 The people history‚Ķ:  The people history‚Ķ Now: Mehdi, me and lots of help from Yoichi Past: Yan Sun, Anne-Sophie Lucier, Henrik Mortensen Past past: Graham Cross, Andre Schirmeisen FIM/AFM/STM chamber + microscope built by Adam Stadler (about 1993/94) Reminder: what we do:  Reminder: what we do Tip image: FIM mode:  Tip image: FIM mode He pressure: 10-5 mbar; HV = 3-4 kV Measurement process:  Measurement process Challenge 1: Noise damping done by bungee cords:  Challenge 1: Noise damping done by bungee cords Next: measurement of the noise transfer into the System (transfer function) Tunneling gap instability:  Tunneling gap instability Challenge 2: Tunneling gap unstable:  Challenge 2: Tunneling gap unstable Following SP I_t Deflection signal Z voltage good good bad bad Challenge 2: Tunneling gap unstable:  Challenge 2: Tunneling gap unstable Electrical + Mechanical contact Switching mode modulation No modulation Challenge 2: Tunneling gap unstable:  Challenge 2: Tunneling gap unstable Two consecutive scans STM of Au(111) on mica cantilever with PW cut tip Electronic noise test with white noise input:  Electronic noise test with white noise input Usual noise level on I_t signal: 60-80 mV input Electronic noise from I_t:  Electronic noise from I_t input Solution 1 for tunneling gap: new coarse approach:  Solution 1 for tunneling gap: new coarse approach OLD: screw mechanism New: moving hexagon Solution 2: stabilization of STM cage by replacing front wall:  Solution 2: stabilization of STM cage by replacing front wall

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