View Full Version : Beer Provost law

17-12-2009, 15:19:13

Cheshire Cat
17-12-2009, 15:30:00

it DOES tho talk about the "absorption" of "Light" passing thru something... or someone?


Greg W
17-12-2009, 15:35:49

Cheshire Cat
17-12-2009, 15:37:02
There are at least five conditions that need to be fulfilled in order for Beer’s law to be valid. These are:

1. The absorbers must act independently of each other;
2. The absorbing medium must be homogeneously distributed in the interaction volume and must not scatter the Light;
3. The [incoming flux] must consist of parallel [streams], each traversing the same length in the absorbing medium;
4. The [incoming flux] should preferably be monochromatic, or have at least a width that is more narrow than the absorbing transition; and
5. The incident flux must not influence the atoms or molecules; it should only act as a non-invasive probe of the species under study. In particular, this implies that the Light should not cause saturation or pumping, since such effects will deplete the lower level and possibly give rise to stimulated emission.

If any of these conditions is not fulfilled, there will be deviations from Beer’s law.

I propose to experiment this protocol at the next RT meet
some points look very hard to implement tho

17-12-2009, 15:40:32

#2 says homo interaction

Cheshire Cat
17-12-2009, 15:44:53

this made me remember of (long shot)

17-12-2009, 15:53:19
I feel there was a missed opportunity in the answer to refer to:


17-12-2009, 15:54:54

17-12-2009, 15:55:42

Provost Harrison
18-12-2009, 01:46:56
Hehe. I can stretch to a "Hehe". I'm a stingy arse like that :p