Question
A nitric oxide molecule is in a rotational energy level described by rotational quantum number l=7....
A nitric oxide molecule is in a rotational energy level described by rotational quantum number l=7. The rotational constant for NO is 1.695 cm-1.
what is the angular momentum?
how many different spatial orientations can this angular momentum vector take?
what is its rotational energy in Joules?
How much energy (in Joules) is required to excite it to the l=8 level?
What is its rotational frequency?
Homework Answers
Answer #1
A NO molecule is in a rotational energy level described by rotational quantum number l =7
the rotational constant for NO = 1.695cm-1
In rotation spectroscopy, for diatomic molecules like NO
solving the schrodinger equation for a rigid rotor gives the following energy levels
where B is rotational constant in cm-1 and J is the angualr momentum
given E(J)=7 and B= 1.695cm-1
7 = 1.695J(J+1)
by solving the above equation
the angular momentum,J=1.59
the rotational energy 
by solving the above equation, the rotational energy = 6.98Joules
where v = rotational quantum number given = 8
w = rataional frequency and rotational energy = 6.98 J
by solving the above equation ,
rotation frequency = 0.8211 Hz
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