1 / 36

Herringbone Reconstruction of Au{111}, 2 IMPORTANT PAPERS:

Herringbone Reconstruction of Au{111}, 2 IMPORTANT PAPERS:. 1. 2. 1. 22. Au{111} 23 x  3. 110. 112. Au{111} 1x1. 110. 112. Au{111} 23 x  3. 110. 112. Au{111} 23 x  3. 110. 112. Au{111} 23 x  3. 110. 110. 112. Au{111} 23 x  3. 3- fold symmetry

shelly
Download Presentation

Herringbone Reconstruction of Au{111}, 2 IMPORTANT PAPERS:

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript

  1. Herringbone Reconstruction of Au{111}, 2 IMPORTANT PAPERS: 1 2

  2. 1 22 Au{111} 23 x 3 110

  3. 112 Au{111} 1x1 110

  4. 112 Au{111} 23 x 3 110

  5. 112 Au{111} 23 x 3 110

  6. 112 Au{111} 23 x 3 110

  7. 110 112 Au{111} 23 x 3

  8. 3- fold symmetry Strain in the one direction is relaxed over whole surface in 2 dimensions

  9. Au{111} 23 x 3 120 degree turns give uniform contraction!

  10. Dimensions: Bulk Au = 2.88 A Therefore in direction spacing = 2.88 A In direction spacing = 2.75 A 110 112 That’s why Maksymovych et al. say average distance = 2.81 A

  11. Au Surface 6 K February 20 Run 4 _3 X = 19.2 nm Y = 19.2 nm Z = 185.1 pm Run 5_2 X = 12.5 nm Y = 12.5 nm Z = 46.13 pm Atomic Resolution Herringbones Adsorbates Atomic resolution Herringbones

  12. Au Surface 6 K SULFUR ATOM AT STEP EDGE? February 20 Run 4_1 X = 19.2 nm Y = 19.2 nm Z = 296.5 pm Adsorbate not on HB Run 3_1 X = 61.7 nm Y = 58.6 nm Z = 432.6 pm

  13. Au Surface 6 K February 20 Run 10_1 X = 125 nm Y = 125 nm Z = 620.9 pm 0.5 V 0.2 nA Adsorbates seen at elbows after heating – styrene?

  14. What about the elbows? hcp fcc hcp fcc fcc hcp

  15. Screw Dislocation: STMA 1004, Vtip = 0.05 V/ 200pA 170 Å x 170 Å

  16. Screw Dislocation:

  17. Screw Dislocation:

  18. Herringbone Defect February 11 run 2_2 80 K 0.5 V Airlegs down X = 7.16 nm Y = 8.62 nm Z = 60.71 pm Steps, terraces, herringbones, missing atom at HB elbow.

  19. Au atoms and defect February 10, run 3_15 80 K Airlegs down 2-D X = 34.8 nm Y = 21.0 nm Z = 76.84 pm Gold atoms, defect in terrace.

  20. CAN WE MODEL THE ELBOW AND UNDERSTAND THE MISSING ATOM AT THE ELBOW? CAN WE RECORD ATOMIC IMAGES OF Au{111} AT 7 K?

  21. Naturally Chiral Surfaces STM of Cu{643} at 80 Kelvin Cu{643} sample was cleaned with 5 cycles of sputtering with Argon at 1.5 keV / 14 µA for 40 min with a 1000 K anneal for 2-3 mins at the end of each cycle.

  22. 3-7 4/13/06 I=0.5 nA V=-0.3 V 125 x 125 nm2 4/19/06

  23. 3-8 4/13/06 50 x 50 nm2 I=0.5 nA V=-0.3 V 4/19/06

  24. 3-8 4/13/06 50 x 50 nm2 I=0.5 nA V=-0.3 V 4/19/06

  25. 3-9 4/13/06 30 x 30 nm2 I=0.5 nA V=-0.3 V 4/19/06

  26. 3-10 4/13/06 20 x 20 nm2 I=0.5 nA V=-0.3 V 4/19/06

  27. 3-11 4/13/06 20 x 20 nm2 I=0.5 nA V=-0.3 V 4/19/06

  28. 3-28 4/13/06 4 x 4 nm2 I=0.1 nA V=-0.3 V 4/19/06

  29. 3-29 4/13/06 5 x 5 nm2 I=0.1 nA V=-0.3 V 4/19/06

  30. 3-31 4/13/06 5 x 5 nm2 I=0.09 nA V=-0.3 V 4/19/06

  31. 3-35 4/13/06 I=0.09 nA V=-0.3 V 4/19/06

  32. 3-36 4/13/06 I=0.09 nA V=-0.3 V 3 x 1.5 nm2 4/19/06

  33. 3-45 4/13/06 9 x 9 nm2 I=0.09 nA V=-0.3 V 4/19/06

  34. 3-45 4/13/06 Comparison: 9 x 9 nm2 I=0.09 nA V=-0.3 V 4/19/06

  35. Next 7 Kelvin Run; Starts Friday: Put in a new tip (W) B4 cold Check Springs are ok Au{111} atomic res? Cu{643} at 7 K – many images to do stats. MCHO dosed on crystal – adsorbs where? MCHO movie while doing 0.2 x 10-11 This week: Movies – so we can see herringbones in every frame

More Related