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**[SOLVED] reduced mass?!**

Hi there,

I know the reduced mass is defining with the below formula:

[tex]\frac{1}{\mu}[/tex] = [tex]\frac{1}{m _{1}} + \frac{1}{m_{2}} + ... [/tex]

In Bohr's radius when i want to find the [tex]\mu[/tex] i use the

m1 = mass of electron

m2 = mass of poroton

but what if i need to find the reduced mass of a molecule like HCI ?

do i have to take the masses of all electrons and protons the molecule has or do i have to just take the masses of C & H & I?

I need it to solve the problem 1.5 page 26 from book: Modern Spectroscopy by Hollas

thanks

sona

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