SIMS Map of MOS 1298 Crater 1

Impact feature information

Experiment A0201
Surface ID 1293 (preflight and postflight images)
Discharge # 1
LDEF Location: Bay B Row 12
Coordinates [mm] x 950.0 +-30.0 y 342.0 +-30.0
JSC ID B12E00 36 1293
Surface Description: MOS detector, north side
Feature Description: impact induced discharge
Origin Description was not available
elliptic central crater diameter: 11 by 19 micrometers
max outer spall diameter: 34 micrometers
Photos available:
- none
Analyses performed:
Notes: NEGATIVE ION IMAGES AVAILABLE

SIMS Images

Below are the SIMS images of this feature. A thumbnail image overview is available, too. The analysis was performed on 04-14-1992. The following mass numbers were imaged:
16, 23, 24, 27, 28, 39, 40, 48, 52, 56, 56, 58, 63, 64, 107

Analytical Conditions:

These parameters directly affect spectrometer signal intensities.
Primary beam:

Gas and polarity: O+
Primary Acceleration Voltage: 15 kV
Secondary Acceleration Voltage: +4.5 kV
Primary beam current: 250 nA
Raster size: 250 micrometers (range 250, pot setting 10)

Secondary beam:

Polarity: +
Transfer Optics Setting: 150 micrometers
Energy slit setting: ?
Energy slit translation: ?
Entrance slit setting: ?
Exit slit setting: ?
Contrast Diaphragm: 3 (150 micrometers)
Field Aperture: 2 (750 micrometers)
Imaged Area: 60
Image Pixel Size: 256 x 256 (aspect ratio correction: multiply y by 0.83)
Channel plate ID: 2

Image 1, O (Mass 16)

signal intensity scale: 0 -> 416; scale bars are 50 micrometers

--------------------------------------------------------------------------------
Element Comments
--------------------------------------------------------------------------------
16O	Primary ion species.
--------------------------------------------------------------------------------
NOTE: An asterisk (*) means that these species were in fact observed on Hi-Res
      Mass Spectra of a particular mass on the Standard.

Image Conditions

These parameters directly affect image intensities.

Number of frames taken: 255
Channel Plate Gain setting: 2.4
Channel Plate ID: 2
total count rate: 724005
max count: 416
species classification positive

Image 2, Mass 23 (Na)
signal intensity scale: 0 -> 213; scale bars are 50 micrometers

-------------------------------------------------------------------------------- % isotopic Resolution Element Interferents abundance (m/Dm) Comments -------------------------------------------------------------------------------- 23Na 30SiO2+ 3.10 -4222 not resolvable, low abundance. Na distri- bution had to be non-co- incident with high con- centration of the Si distribution for a positive ID. Looked for NaH (not resolvable from 12C2) and/or NaO (not resolvable from 27AlC) in samples with high Si. *46Ti2+,46Ca2+ <1776 resolved -------------------------------------------------------------------------------- NOTE: An asterisk (*) means that these species were in fact observed on Hi-Res Mass Spectra of a particular mass on the Standard.

Image Conditions
These parameters directly affect image intensities.

Number of frames taken: 500
Channel Plate Gain setting: 2.4
Channel Plate ID: 2
total count rate: 72846
max count: 213
species classification probable
sensitivity factor for material implanted in Si matrix: 139.0000

Image 3, Mass 24 (Mg)
signal intensity scale: 0 -> 226; scale bars are 50 micrometers

-------------------------------------------------------------------------------- Resolution Element Interferents (m/Dm) Comments -------------------------------------------------------------------------------- 24Mg *48Ti2+,48Ca2+,*23NaH+,12C2 <2731 resolved -------------------------------------------------------------------------------- NOTE: An asterisk (*) means that these species were in fact observed on Hi-Res Mass Spectra of a particular mass on the Standard.

Image Conditions
These parameters directly affect image intensities.

Number of frames taken: 500
Channel Plate Gain setting: 2.4
Channel Plate ID: 2
total count rate: 59212
max count: 226
species classification probable
sensitivity factor for material implanted in Si matrix: 18.0000

Image 4, Al (Mass 27)
signal intensity scale: 0 -> 6389; scale bars are 50 micrometers

NOTE: CHANNEL PLATE GAIN AND PRIMARY BEAM CURRENT WAS REDUCED SUBSTANTIALLY ON Aluminum SUBSTRATES. -------------------------------------------------------------------------------- % isotopic Resolution Element Interferents abundance (m/Dm) Comments -------------------------------------------------------------------------------- 27Al *26MgH 11.0 +3042 moderate abundance, idenitfied Al line if sample with low Al 54Cr2+,*13C15N,*12C2H3,54Fe2+ <2298 resolved -------------------------------------------------------------------------------- NOTE: An asterisk (*) means that these species were in fact observed on Hi-Res Mass Spectra of a particular mass on the Standard.

Image Conditions
These parameters directly affect image intensities.

Number of frames taken: 255
Channel Plate Gain setting: 1.0
Channel Plate ID: 2
total count rate: 27454501
max count: 6389
species classification positive
sensitivity factor for material implanted in Si matrix: 36.0000

Image 5, Si (Mass 28)
signal intensity scale: 0 -> 4376; scale bars are 50 micrometers

NOTE: USED 28SI ON NON-SI SUBSTRATES. -------------------------------------------------------------------------------- Resolution Element Interferents (m/Dm) Comments -------------------------------------------------------------------------------- 28Si *56Fe2+,*27AlH,*12CO,12C2H4 <2957 resolved -------------------------------------------------------------------------------- NOTE: An asterisk (*) means that these species were in fact observed on Hi-Res Mass Spectra of a particular mass on the Standard.

Image Conditions
These parameters directly affect image intensities.

Number of frames taken: 255
Channel Plate Gain setting: 1.3
Channel Plate ID: 2
total count rate: 11917718
max count: 4376
species classification positive
sensitivity factor for material implanted in Si matrix: 1.0000

Image 6, Mass 39 (K)
signal intensity scale: 0 -> 320; scale bars are 50 micrometers

-------------------------------------------------------------------------------- Resolution Element Interferents (m/Dm) Comments -------------------------------------------------------------------------------- 39K *27AlC,23NaO,12C3H3 <2190 resolved -------------------------------------------------------------------------------- NOTE: An asterisk (*) means that these species were in fact observed on Hi-Res Mass Spectra of a particular mass on the Standard.

Image Conditions
These parameters directly affect image intensities.

Number of frames taken: 500
Channel Plate Gain setting: 2.4
Channel Plate ID: 2
total count rate: 61294
max count: 320
species classification probable
sensitivity factor for material implanted in Si matrix: 125.0000

Image 7, Ca (Mass 40)
signal intensity scale: 0 -> 271; scale bars are 50 micrometers

-------------------------------------------------------------------------------- % isotopic Resolution Element Interferents abundance (m/Dm) Comments -------------------------------------------------------------------------------- 40Ca 40K 0.012 +28,000 not resolvable, very low abundance. 39KH 93.1 +4470 not resolvable, used 44Ca (SiO resolvable interference) or non- coinci-dence with K dis- tribution *28SiC,*24MgO,27Al13C, <2993 resolved 12C2O,12C3H4 -------------------------------------------------------------------------------- NOTE: An asterisk (*) means that these species were in fact observed on Hi-Res Mass Spectra of a particular mass on the Standard.

Image Conditions
These parameters directly affect image intensities.

Number of frames taken: 255
Channel Plate Gain setting: 2.4
Channel Plate ID: 2
total count rate: 300456
max count: 271
species classification positive
sensitivity factor for material implanted in Si matrix: 38.5000

Image 8, Mass 48 (unidentified)
signal intensity scale: 0 -> 129; scale bars are 50 micrometers

-------------------------------------------------------------------------------- % isotopic Resolution Element Interferents abundance (m/Dm) Comments -------------------------------------------------------------------------------- 48Ti 96Mo2+ 16.5 +11,000 not resolvable, presence unlikely 48Ca 0.185 +10,000 not resolvable, very low abundance, Ti must be non-coincident with Ca, looked at 47Ti line *47TiH 7.29 +4123 appears as a small peak on the right slope of the 48Ti peak *24Mg2+,48O3,24MgC2,12C4 <2167 resolved -------------------------------------------------------------------------------- NOTE: An asterisk (*) means that these species were in fact observed on Hi-Res Mass Spectra of a particular mass on the Standard.

Image Conditions
These parameters directly affect image intensities.

Number of frames taken: 1000
Channel Plate Gain setting: 2.4
Channel Plate ID: 2
total count rate: 4825
max count: 129
species not classified
operator note "only one mass seen" in notebook

Image 9, Mass 52 (unidentified)
signal intensity scale: 0 -> 94; scale bars are 50 micrometers

-------------------------------------------------------------------------------- % isotopic Resolution Element Interferents abundance (m/Dm) Comments -------------------------------------------------------------------------------- 52Cr 28Si24Mg,*40CaC,26Mg2, <2420 resolved 25MgAl,40KC,28SiC2 -------------------------------------------------------------------------------- NOTE: An asterisk (*) means that these species were in fact observed on Hi-Res Mass Spectra of a particular mass on the Standard.

Image Conditions
These parameters directly affect image intensities.

Number of frames taken: 1000
Channel Plate Gain setting: 2.4
Channel Plate ID: 2
total count rate: 3701
max count: 94
species not classified
operator note "only one mass seen" in notebook

Image 10, Mass 56 (Fe)
signal intensity scale: 0 -> 182; scale bars are 50 micrometers

NOTE: 28Si2 and 40CaO are not resolvable among themselves and appear as one peak to the right of the 56Fe peak. -------------------------------------------------------------------------------- % isotopic Resolution Element Interferents abundance (m/Dm) Comments -------------------------------------------------------------------------------- 56Fe --AND-- 56Si2 55MnH 99.9 +5118 not resolvable, unlikely to be present without Fe *28Si2,44CaC,*40CaO,29SiAl, <2956 resolved 40KO,32SC2,24MgO2,C4H6 -------------------------------------------------------------------------------- NOTE: An asterisk (*) means that these species were in fact observed on Hi-Res Mass Spectra of a particular mass on the Standard.

Image Conditions
These parameters directly affect image intensities.

Number of frames taken: 500
Channel Plate Gain setting: 2.4
Channel Plate ID: 2
total count rate: 24236
max count: 182
species classification probable
sensitivity factor for material implanted in Si matrix: 1.8500
operator note "used lower mass" in notebook

Image 11, Si2 (Mass 56)
signal intensity scale: 0 -> 414; scale bars are 50 micrometers

NOTE: 28Si2 and 40CaO are not resolvable among themselves and appear as one peak to the right of the 56Fe peak. -------------------------------------------------------------------------------- % isotopic Resolution Element Interferents abundance (m/Dm) Comments -------------------------------------------------------------------------------- 56Fe --AND-- 56Si2 55MnH 99.9 +5118 not resolvable, unlikely to be present without Fe *28Si2,44CaC,*40CaO,29SiAl, <2956 resolved 40KO,32SC2,24MgO2,C4H6 -------------------------------------------------------------------------------- NOTE: An asterisk (*) means that these species were in fact observed on Hi-Res Mass Spectra of a particular mass on the Standard.

Image Conditions
These parameters directly affect image intensities.

Number of frames taken: 255
Channel Plate Gain setting: 2.4
Channel Plate ID: 2
total count rate: 311306
max count: 414
species classification positive
sensitivity factor for material implanted in Si matrix: 1.0000
operator note "used higher mass" in notebook

Image 12, Mass 58 (unidentified)
signal intensity scale: 0 -> 185; scale bars are 50 micrometers

NOTE: THIS IMAGE IS MOST LIKELY A COMBINATION OF 58Si2, Si2H, Si2H2, FeH, and (only if present) 58Ni. NOTE: Ni MUST be NON-COINCIDENT with Fe AND Si (unlikely if it is present) for POSITIVE, QUANTITATIVE IDENTIFICATION. It should be possible to identify Ni using measured responses for non- resolvable interferences and their parent elemental isotopes -------------------------------------------------------------------------------- % isotopic Resolution Element Interferents abundance (m/Dm) Comments -------------------------------------------------------------------------------- 58Ni 58Fe 0.33 -28,000 not resolvable, very low (68.3%) abundance 57FeH 2.19 +7352 not resolvable, low abundance 58Si2 5.92 +3777 not resolvable -------------------------------------------------------------------------------- NOTE: An asterisk (*) means that these species were in fact observed on Hi-Res Mass Spectra of a particular mass on the Standard.

Image Conditions
These parameters directly affect image intensities.

Number of frames taken: 500
Channel Plate Gain setting: 2.4
Channel Plate ID: 2
total count rate: 34992
max count: 185
species not classified
operator note "only one mass seen" in notebook

Image 13, Mass 63 (unidentified)
signal intensity scale: 0 -> 95; scale bars are 50 micrometers

-------------------------------------------------------------------------------- % isotopic Resolution Element Interferents abundance (m/Dm) Comments -------------------------------------------------------------------------------- 63Cu 62NiH 3.66 +9578 not resolvable, Cu must be non-co-incident with Ni for positive identifi- cation * 47TiO 7.26 +3684 not resolvable, Cu must be non-coincident with Ti for positive identifi- cation 39KC2,27AlC3,C5H3 <1844 resolved -------------------------------------------------------------------------------- NOTE: An asterisk (*) means that these species were in fact observed on Hi-Res Mass Spectra of a particular mass on the Standard.

Image Conditions
These parameters directly affect image intensities.

Number of frames taken: 1000
Channel Plate Gain setting: 2.4
Channel Plate ID: 2
total count rate: 4748
max count: 95
species not classified
operator note "only one mass seen" in notebook

Image 14
Black image; no counts at this mass.

Image 15
Black image; no counts at this mass.

Mass Ratio Plot
The image displayed below shows the area (79,70 to 157,150) and the image (number 1, mass 16) that was used to compute mass ratios.

Only identifiable masses with the same channel plate gain value and ID may be displayed. The plot shows data points with Relative Sensitivity Factors for both material implanted in a silicon matrix and material implanted in a lunar analog glass matrix applied to them. When comparing the values of the data file available for this feature with the data of another feature, all instrument and image acquisition parameters must be the same to make any quantitative comparison of these two features. The values in the data file are shift-corrected pixel counts summed over the entire area inside the box and divided by the box area. 48Ti signals are corrected for 48Ca (0.185abundance, not resolvable). Please refer to the element classification information for the interpretation of this plot.

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Klaus G. Paul, 7-12-1994