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| The Early
Stages of Etching |
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| In order to develop an understanding of the initial formation of holes, high magnifications were used to study how etching occurs in the first hour. Note: This particular batch was etched in 70 degree 6M NaOH. This would
yield smaller diameter pits than the standard 80 degree etch. |
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| 20 minutes (---
= 1.63 um) 25 minutes(--- = 1.81 um) 30 minutes(---
= 1.81 um) |
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| 35 minutes(--- =
2.65 um) 40 minutes(--- = 1.95 um) 45 minutes(---
= 1.93 um) |
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| 50 minutes(--- =
2.55 um) 55 minutes(--- = 2.78 um) 60 minutes(---
= 2.55 um) |
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