Herringbone Reconstruction of Au111 2 IMPORTANT PAPERS 1

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

Au{111} 23 x 3 1 22 110

112 Au{111} 1 x 1 110

112 Au{111} 23 x 3 110

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

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

Dimensions: Bulk Au = 2. 88 A Therefore in In 110 112 direction spacing = 2. 88 A direction spacing = 2. 75 A That’s why Maksymovych et al. say average distance = 2. 81 A

Au Surface 6 K February 20 Run 4 _3 X = 19. 2 nm Y = 19. 2 nm Z = 185. 1 pm Adsorbates Atomic resolution Herringbones Run 5_2 X = 12. 5 nm Y = 12. 5 nm Z = 46. 13 pm Atomic Resolution Herringbones

Au Surface 6 K SULFUR ATOM AT STEP EDGE? Run 3_1 X = 61. 7 nm Y = 58. 6 nm Z = 432. 6 pm February 20 Run 4_1 X = 19. 2 nm Y = 19. 2 nm Z = 296. 5 pm Adsorbate not on HB

Au Surface 6 K February 20 Run 10_1 X = 125 nm Y = 125 nm Z = 620. 9 pm 0. 5 V 0. 2 n. A Adsorbates seen at elbows after heating – styrene?

hc p What about the elbows? hc p fcc

Screw Dislocation: STMA 1004, Vtip = 0. 05 V/ 200 p. A 170 Å x 170 Å

Screw Dislocation:

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.

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.

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

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 ke. V / 14 µA for 40 min with a 1000 K anneal for 2 -3 mins at the end of each cycle.

3 -7 4/13/06 125 x 125 nm 2 I=0. 5 n. A V=-0. 3 V 4/19/06

3 -8 4/13/06 50 x 50 nm 2 I=0. 5 n. A V=-0. 3 V 4/19/06

3 -9 4/13/06 30 x 30 nm 2 I=0. 5 n. A V=-0. 3 V 4/19/06

3 -10 4/13/06 20 x 20 nm 2 I=0. 5 n. A V=-0. 3 V 4/19/06

3 -11 4/13/06 20 x 20 nm 2 I=0. 5 n. A V=-0. 3 V 4/19/06

3 -28 4/13/06 4 x 4 nm 2 I=0. 1 n. A V=-0. 3 V 4/19/06

3 -29 4/13/06 5 x 5 nm 2 I=0. 1 n. A V=-0. 3 V 4/19/06

3 -31 4/13/06 5 x 5 nm 2 I=0. 09 n. A V=-0. 3 V 4/19/06

3 -35 4/13/06 I=0. 09 n. A V=-0. 3 V 4/19/06

3 -36 4/13/06 3 x 1. 5 nm 2 I=0. 09 n. A V=-0. 3 V 4/19/06

3 -45 4/13/06 9 x 9 nm 2 I=0. 09 n. A V=-0. 3 V 4/19/06

3 -45 4/13/06 Comparison: 9 x 9 nm 2 I=0. 09 n. A V=-0. 3 V 4/19/06

Next 7 Kelvin Run; Starts Friday: Put in a new tip (W) B 4 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