CCD-world: Fwd from Jim Janesick: UV response

[Tim Abbott]

The following was posted to CCD-world:


This is forwarded from Jim Janesick (who got a strange error when he
tried to post it himself, perhaps majordomo has something against AOL):

MYPIXEL at aol.com wrote:
> 
>  I'm doing some experiments in the vacuum UV (below 193nm) and using CsTe and
>  CsI
>  PMTs. I noticed that NIST has some SI diodes that it calibrates from 254nm
>  to 5nm.
>  This got me wondering.....how do CCD's respond below 193nm? I found some
>  data
>  >From Jim Lesser at Steward that shows Hafnium dioxide coated CCD QEs of
>  about 30%
>  at 200nm. Does any one know if there is measureable QE at say 150 or 121 nm. 
> >>
> 
> 
> *************************jj
> There is WF/PC II Hubble UV QE data available down to 1216 A (lyman-alpha)..  
> . . data is for a lumigen phosphor coated CCD though. Response is flat down 
> to 500 A at 15 %. Then there is some WF/PC II data for a UV charged QE-pinned 
> CCD (response is basically reflection limit including quantum yield of 3 at 
> 1216 A). Lastly, MBE accumulated CCDs have gone through the exercise . . . 
> again reflection limited. Let me know it any of this data is useful ..  . EUV 
> performance is highly dependent on the manufacturer and processes used on 
> backside. AR coatings stop working at about 2000 A.
> ***************************jj

-- 
Tim Abbott                                                    tabbott at not.iac.es
Support Astronomer                               http://www.not.iac.es/~tabbott/
                           Nordic Optical Telescope
       Apartado 474 E-38700, Santa Cruz de La Palma, Canary Islands, Spain
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