Forum der Vereinigung der Sternfreunde

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PostPosted: 02. February 2020, 23:14:58 PM 
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Meister
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Location: Dresden
Hi guys,

Just a question regarding the Ar purged ATIK CCD: Do you have experience whether there are artifical absorption lines in (mid and high res) stellar spectra due to the Ar fill?

Thanks for your advices.

Regards
Thomas


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PostPosted: 03. February 2020, 10:44:32 AM 
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Meister
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Hi Thomas,
Quote:
Just a question regarding the Ar purged ATIK CCD: Do you have experience whether there are artifical absorption lines in (mid and high res) stellar spectra due to the Ar fill?
I have no experience, but I think that you can expect only absorption from the ground state of neutral argon. All these transitions are in the far UV, so I would not worry about this.

Best regards,
Otmar


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PostPosted: 03. February 2020, 18:23:35 PM 
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Die Differenz zwischen dem Grundzustand und dem nächst höheren Energieniveau beträgt 11,548 eV, was fast dem Ionisationspotential von Wasserstoff (13,6 eV) entspricht. Setzen wir ein thermisches Gleichgewicht in der Atik voraus, sind praktisch alle Ar-Atome gemäß der Boltzmannverteilung im Grundzustand, was Otmars Annahme bestätigt.
https://physics.nist.gov/cgi-bin/ASD/en ... rieve+Data
Viele Grüße
Christian


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PostPosted: 03. February 2020, 22:13:46 PM 
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Hallo Otmar und Christian,

danke für die Antworten. Wenn was im Plasma des Gases Ar leuchtet, dann heißt das noch lange nicht, dass das Gas Ar bei Raumtemperatur an den Stellen absorbiert.

Grüße
Thomas


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