# Unit conversion meV to cm

Dear PF members,
We know that 1 meV = 8.066 cm-1. So now can i say 1 cm = 8.066 meV-1 ????
Ps: 1 cm-1 = 0.124 meV.

## Answers and Replies

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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.

ZapperZ
Staff Emeritus
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.

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

ZapperZ
Staff Emeritus
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.

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.

Hi, how i calculate (and many ppl. do)..
we know
$$E=hc/\lambda$$
and so
$$1/\lambda=E/(hc)$$
Now by taking E = 1 eV, h in eVs and c in cm/s
one will get $$1/\lambda$$ = 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!]

yes i solved this problem..sorry

THank you ZapperZ.There was I thinking it might be something complicated.

alxm