Unit conversion meV to cm

  • Thread starter Rajini
  • Start date
  • #1
611
2
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
2,479
99
I'm not sure what you are saying here Rajini because your units dont balance.An eV is a unit of energy.
 
  • #3
ZapperZ
Staff Emeritus
Science Advisor
Education Advisor
Insights Author
35,847
4,669
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
2,479
99
Whoops....sorry Rajini and thank you ZapperZ.Can you please give me some ideas about where to google to get more information?
 
  • #5
ZapperZ
Staff Emeritus
Science Advisor
Education Advisor
Insights Author
35,847
4,669
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
611
2
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
611
2
yes i solved this problem..sorry
 
  • #8
2,479
99
THank you ZapperZ.There was I thinking it might be something complicated.
 
  • #9
alxm
Science Advisor
1,842
9
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 :)
 

Related Threads on Unit conversion meV to cm

  • Last Post
Replies
12
Views
36K
  • Last Post
Replies
4
Views
2K
Replies
3
Views
4K
  • Last Post
Replies
3
Views
10K
Replies
5
Views
2K
  • Last Post
Replies
2
Views
2K
  • Last Post
Replies
2
Views
937
Replies
1
Views
30K
Replies
2
Views
2K
  • Last Post
Replies
8
Views
5K
Top