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

1

2

Au{111} 23 x 3

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1 22

110

112

Au{111} 1x1

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112

Au{111} 23 x 3

110

112

Au{111} 23 x 3

110

112

Au{111} 23 x 3

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112

Au{111} 23 x 3

3- fold symmetry

Strain in the one direction is relaxed over whole surface

in 2 dimensions

120 degree turns give uniform contraction!

Au{111} 23 x 3

Dimensions:

Bulk Au = 2.88 A

Therefore in direction spacing = 2.88 A

In direction spacing = 2.75 A

112

110

That’s why Maksymovych et al. say average distance = 2.81 A

Au Surface 6 KFebruary 20

Run 4 _3X = 19.2 nmY = 19.2 nmZ = 185.1 pm

Run 5_2X = 12.5 nmY = 12.5 nmZ = 46.13 pm

AdsorbatesAtomic resolutionHerringbones

Atomic ResolutionHerringbones

Au Surface 6 KFebruary 20

Run 3_1X = 61.7 nmY = 58.6 nmZ = 432.6 pm

Run 4_1X = 19.2 nmY = 19.2 nmZ = 296.5 pm

Adsorbate not on HB

SULFUR ATOM AT STEP EDGE?

Au Surface 6 K

February 20 Run 10_1

X = 125 nmY = 125 nm

Z = 620.9 pm

0.5 V0.2 nA

Adsorbates seen at elbowsafter heating – styrene?

fcc

fcc

fcc

hcp

hcp

hcp

What about the elbows?

STMA 1004, Vtip = 0.05 V/ 200pA

170 Å x 170 Å

Screw Dislocation:

Screw Dislocation:

Screw Dislocation:

Herringbone Defect

X = 7.16 nmY = 8.62 nmZ = 60.71 pm

February 11 run 2_280 K0.5 V

Airlegs down

Steps, terraces, herringbones, missing atom at HB elbow.

Au atoms and defect

2-D

X = 34.8 nm

Y = 21.0 nm

Z = 76.84 pm

February 10, run 3_1580 K

Airlegs down

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 keV / 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 nm2 I=0.5 nAV=-0.3 V 4/19/06

50 x 50 nm2

4/19/06

3-8 4/13/06

I=0.5 nAV=-0.3 V

50 x 50 nm2

4/19/06

3-8 4/13/06

I=0.5 nAV=-0.3 V

4/19/06

3-9 4/13/06

I=0.5 nAV=-0.3 V

30 x 30 nm2

20 x 20 nm2

4/19/06

3-10 4/13/06

I=0.5 nAV=-0.3 V

20 x 20 nm2

4/19/06

3-11 4/13/06

I=0.5 nAV=-0.3 V

I=0.1 nAV=-0.3 V

4 x 4 nm2

4/19/06

3-28 4/13/06

5 x 5 nm2

4/19/06

3-29 4/13/06

I=0.1 nAV=-0.3 V

I=0.09 nAV=-0.3 V

5 x 5 nm2

4/19/06

3-31 4/13/06

4/19/06

3-35 4/13/06

I=0.09 nAV=-0.3 V

3 x 1.5 nm2

4/19/06

3-36 4/13/06

I=0.09 nAV=-0.3 V

9 x 9 nm2

4/19/06

3-45 4/13/06

I=0.09 nAV=-0.3 V

9 x 9 nm2

4/19/06

3-45 4/13/06

I=0.09 nAV=-0.3 V

Comparison:

Next 7 Kelvin Run; Starts Friday:

Put in a new tip (W) B4 coldCheck 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