File:SpectroscopyResearch 021.jpg

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Because the distance of Mars was decreasing at the time, there is a Doppler shift in the Martian spectrum towards the shorter wavelengths. However, this only affects lines originating on Mars or present in the original sunlight that Mars reflects. The Doppler shift is clearly eviden at places marked by arrows. In the case of the strong absorption line at 7187.38 A, which is a blend of a solar iron line and a terrestrial water-vapor line, the shift is sufficient for the iron line to form a new blend with the H2) line at 7187.01 A and thereby alter the relative strengths of the lines (compare adjacent spectrum of the moon). If oxygen or water-vapor lines were present in these Martian spectra, they ought to appear as faint companions to the corresponding lines produced by the earth's atmosphere, but no such companion lines are to be seen.

Date

21 July 1956

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National Institute of Standards and Technology

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National Institute of Standards and Technology

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This image is in the public domain in the United States because it is a work of the United States Federal Government, specifically an employee of the National Institute of Standards and Technology, under the terms of Title 17, Chapter 1, Section 105 of the US Code.

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This image is in the public domain in the United States because it is a work of the United States Federal Government, specifically an employee of the National Institute of Standards and Technology, under the terms of Title 17, Chapter 1, Section 105 of the US Code.

English ∙ 日本語 ∙ македонски ∙ Nederlands ∙ +/−

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	Date/Time	Thumbnail	Dimensions	User	Comment
current	15:37, 11 March 2014		5,993 × 4,779 (20.72 MB)	NISTResearchLibrary (talk \| contribs)

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This file contains additional information such as Exif metadata which may have been added by the digital camera, scanner, or software program used to create or digitize it. If the file has been modified from its original state, some details such as the timestamp may not fully reflect those of the original file. The timestamp is only as accurate as the clock in the camera, and it may be completely wrong.

Image title	Because the distance of Mars was decreasing at the time, there is a Doppler shift in the Martian spectrum towards the shorter wavelengths. However, this only affects lines originating on Mars or present in the original sunlight that Mars reflects. The Doppler shift is clearly eviden at places marked by arrows. In the case of the strong absorption line at 7187.38 A, which is a blend of a solar iron line and a terrestrial water-vapor line, the shift is sufficient for the iron line to form a new blend with the H2) line at 7187.01 A and thereby alter the relative strengths of the lines (compare adjacent spectrum of the moon). If oxygen or water-vapor lines were present in these Martian spectra, they ought to appear as faint companions to the corresponding lines produced by the earth's atmosphere, but no such companion lines are to be seen.
Author	National Institute of Standards and Technology
Copyright holder	The images in the Spectroscopy Photographic Collection are in the public domain and are not subject to copyright in the United States. However, please pay special attention to the individual works to make sure there are no copyright restrictions indicated. Individual works may require securing other permissions from the original copyright holder. Use of the images from NIST Digital Collections is not restricted, but a statement of attribution is required. Please use the following attribution statement: "National Institute of Standards and Technology Digital Collections, Gaithersburg, MD 20899."
Headline	National Institute of Standards and Technology
Source	Spectroscopy Photographic Collection
Short title	High dispersion spectra of mars and the moon obtained by NBS scientists on Mauna Loa July 21-22, 1956
Date and time of data generation	21 July 1956
Width	5,993 px
Height	4,779 px
Bits per component	8 8 8
Compression scheme	Uncompressed
Pixel composition	RGB
Orientation	Normal
Number of components	3
Horizontal resolution	600 dpi
Vertical resolution	600 dpi
Data arrangement	chunky format
Software used	Adobe Photoshop CS6 (Windows)
File change date and time	09:55, 23 September 2013
Exif version	2.21
Color space	Uncalibrated
Unique ID of original document	768DA80810647E9CA53E7D6C26CB1FEC
Original transmission location code	25791-2192
Date metadata was last modified	05:55, 23 September 2013
Date and time of digitizing	09:47, 22 August 2013
Keywords	United States. National Bureau of Standards--Photograph collections. Spectrum analysis--Photograph collections.
Contact information	library@nist.gov 100 Bureau Dr, MS 2500 Gaithersburg, MD, 20899 301-975-3052
IIM version	4

File:SpectroscopyResearch 021.jpg

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21 July 1956