Unit conversion meV to cm

  • Thread starter Rajini
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  • #1
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Dear PF members,
We know that 1 meV = 8.066 cm-1. So now can i say 1 cm = 8.066 meV-1 ????
thanks for your reply.
Ps: 1 cm-1 = 0.124 meV.
 

Answers and Replies

  • #2
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I'm not sure what you are saying here Rajini because your units dont balance.An eV is a unit of energy.
 
  • #3
ZapperZ
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This is a common "short form" used in condensed matter/solid state physics, especially in optical conductivity measurement. 1 eV is "equivalent" to 8.0655 x 10^3 cm^-1. It's one of those simplified notation that sets k=h=c=1.

Zz.
 
  • #4
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Whoops....sorry Rajini and thank you ZapperZ.Can you please give me some ideas about where to google to get more information?
 
  • #5
ZapperZ
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Whoops....sorry Rajini and thank you ZapperZ.Can you please give me some ideas about where to google to get more information?

It actually is a straight-forward conversion.

Start with E=hf.

So if you have 1 eV = hf, it gives you an equivalence

1 eV == 2.4 e14 Hz

but we know that f = c/lambda.

So 1/lambda = cf = 8.05 e3/cm == 1 eV.

The list of values of the conversion from 1 eV into frequency, 1/cm, and Kelvin can be found in the inside back cover of Ashcroft and Mermin's Solid State Text.

Zz.
 
  • #6
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Hi, how i calculate (and many ppl. do)..
we know
[tex]E=hc/\lambda[/tex]
and so
[tex]1/\lambda=E/(hc)[/tex]
Now by taking E = 1 eV, h in eVs and c in cm/s
one will get [tex]1/\lambda[/tex] = 8066 cm-1 (for E= 1 eV).
So 1 meV = 8.066 cm-1
But my questions is whether the following is correct or not!!!!!???
1 cm = 8.066 meV-1 [i just reversed the units!]

thanks for your reply
 
  • #7
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yes i solved this problem..sorry
 
  • #8
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THank you ZapperZ.There was I thinking it might be something complicated.
 
  • #9
alxm
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But my questions is whether the following is correct or not!!!!!???
1 cm = 8.066 meV-1 [i just reversed the units!]

Yes, but remember here that it's (meV)-1 and not milli-(eV)-1,
just as cm-1 is taken to mean 1/centimeters and not 100ths of 1/m.

First time I worked with cm-1 I kept being off by a factor of 10,000 for some reason :)
 

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