Table 1.
Surface compositions of the C16 COOH-SAM on the flat Au surface measured or simulated at nine different emission angles ranging from 5 to 85° in 10° increments. The simulated compositions were based on 1.2Å per CH2 group, RSA = 1.04, and with or without a 1.5Å CH2-contamination layer. (Standard deviations are shown in parentheses)
| Photoelectron Take-off Angles (°) | XPS (atomic %) | SESSA: 1.2Å per CH2; RSA–1.04 No contamination (atomic %) |
SESSA: 1.2Å per CH2; RSA–1.04 Contamination = 1.5Å CH2 (atomic %) |
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|---|---|---|---|---|---|---|---|---|---|---|---|---|
| C 1s | Au 4f | O 1s | S 2p | C 1s | Au 4f | O 1s | S 2p | C 1s | Au 4f | O 1s | S 2p | |
| 5 | 54.0 (2.8) | 33.6 (1.5) | 10.7 (1.5) | 1.7 (0.2) | 52.9 | 34.5 | 10.2 | 2.4 | 56.3 | 32.6 | 9.0 | 2.1 |
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| 15 | 54.7 (2.3) | 32.6 (1.1) | 10.9 (0.8) | 1.8 (0.4) | 54.4 | 33.8 | 9.6 | 2.3 | 55.1 | 33.9 | 8.8 | 2.2 |
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| 25 | 56.7 (2.9) | 30.0 (1.5) | 11.1 (0.4) | 2.3 (1.0) | 55.9 | 30.7 | 10.8 | 2.6 | 55.6 | 32.2 | 10.0 | 2.2 |
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| 35 | 58.3 (0.7) | 27.3 (0.5) | 12.6 (0.6) | 1.8 (0.6) | 57.6 | 29.1 | 11.1 | 2.3 | 60.1 | 25.9 | 11.9 | 2.1 |
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| 45 | 60.3 (1.5) | 24.9 (1.1) | 13.2 (0.8) | 1.8 (0.3) | 58.1 | 24.7 | 14.9 | 2.3 | 62.4 | 23.6 | 11.9 | 2.1 |
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| 55 | 64.9 (0.4) | 19.4 (0.6) | 13.9 (1.0) | 1.9 (0.1) | 61.7 | 17.3 | 19.2 | 1.8 | 67.4 | 16.2 | 14.4 | 2.0 |
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| 65 | 68.2 (1.0) | 14.0 (0.9) | 16.0 (0.3) | 1.9 (0.5) | 62.2 | 10.5 | 26.1 | 1.3 | 71.7 | 10.7 | 16.3 | 1.4 |
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| 75 | 72.2 (2.1) | 9.1 (1.8) | 17.8 (1.3) | 0.8 (0.5) | 57.8 | 6.9 | 34.3 | 1.0 | 74.0 | 6.9 | 18.0 | 1.0 |
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| 85 | 74.6 (2.2) | 5.1 (0.9) | 20.3 (1.3) | nd | 55.0 | 4.9 | 38.9 | 1.2 | 74.3 | 5.2 | 19.9 | 0.7 |
nd = not detected