2 electron sensitization

Are there any films besides movie films that have this yet?, And if not
do you think Kodak may deliberately not bring this to standard films,
like Portra ETC?

http://kodak.com/country/US/en/corp/...tron2002.shtml

On 2 Jan 2006 13:37:35 -0800, wrote:

Are there any films besides movie films that have this yet?, And if not
do you think Kodak may deliberately not bring this to standard films,
like Portra ETC?

http://kodak.com/country/US/en/corp/...tron2002.shtml

Haven't you heard?? There are some here that claim film is dead so why
spend money on it???

Well they already developed it!

wrote:
Are there any films besides movie films that have this yet?
And if not do you think Kodak may deliberately not bring this
to standard films, like Portra etc?

I remember this photo.net thread about a year ago, which implied
that 2-electron sensitization was not yet being used in still film.

http://photo.net/bboard/q-and-a-fetch-msg?msg_id=007msz

New Portra 800-2 seems mighty fast, perhaps 1000 speed or higher,
but the datasheet does not discuss 2ES.

"The formate doping gave very close to two silver atoms per photon.
The formate ion scavenges the electron from the initial excitation,
preventing recombination and so increasing the film's sensitivity.
The formate molecule dissociates into H2 and a C02 radical, and
the de-excitation of the CO2 radical reduces a second Ag atom,
boosting the sensitivity still further. All this assumes that the
original photon had enough energy, which is why the process is
rumoured to be less efficient with red light." --Struan Gray

Bill Tuthill quoted:
"The formate doping gave very close to two silver atoms per photon.
The formate ion scavenges the electron from the initial excitation,
preventing recombination and so increasing the film's sensitivity.
The formate molecule dissociates into H2 and a C02 radical, and
the de-excitation of the CO2 radical reduces a second Ag atom,
boosting the sensitivity still further. All this assumes that the
original photon had enough energy, which is why the process is
rumoured to be less efficient with red light." --Struan Gray

Formate doping is probably not the same as 2 electron sensitization,
although both can improve speed without increasing grain.