Calculating CO2 Rotational Constant | J=0,1,2,3,4,5 Excited State Analysis

AI Thread Summary
The discussion focuses on calculating the rotational constant for CO2 using values for different rotational quantum numbers (J) in both ground and excited states. The user seeks to determine B(0) and B(1) to subsequently find B(e), emphasizing the need to plot data to derive these constants. Key points include the distinction between energy levels for rigid and non-rigid rotors and the importance of having transition energy data for accurate calculations. The user mentions having only wavenumbers for various J values in the P and R branches, which indicates a ro-vibrational spectrum analysis. The conversation highlights the necessity of providing sufficient information for effective assistance in solving the problem.
Nanosciencee
Messages
3
Reaction score
0
Hey!

I have a problem. The problem is simple: calculate CO2 rotational constant. I have values for J (ground state and excited state), with those grades I have to calculate rotational constant. I know that for J=0,2,4.. it is just in ground state and for J=1,3,5..it is excited state. But how do I can calculate B(0) and B(1), because with those I can calculate B(e). I also know that I have to plot and from slope I get those B grades, but what are in x/y-axis?
 
Physics news on Phys.org
Nanosciencee said:
Hey!

I have a problem. The problem is simple: calculate CO2 rotational constant. I have values for J (ground state and excited state), with those grades I have to calculate rotational constant. I know that for J=0,2,4.. it is just in ground state and for J=1,3,5..it is excited state. But how do I can calculate B(0) and B(1), because with those I can calculate B(e). I also know that I have to plot and from slope I get those B grades, but what are in x/y-axis?

You are confused, a bit.

For a rigid rotor, the energy levels are given by: E_rot = B* J*(J+1), J = 0, 1, 2, ...
For a non-rigid rotor, there are additional terms (centrifugal distortion constant, etc.)

Usually, you are given the energy levels or the transition energies between levels, and you use this information to find the rotational constant.

What data do you actually have?
 
Just wavenumbers for different J grades in P and R branch, nothing else.
 
Quantum Defect said:
You are confused, a bit.

For a rigid rotor, the energy levels are given by: E_rot = B* J*(J+1), J = 0, 1, 2, ...
For a non-rigid rotor, there are additional terms (centrifugal distortion constant, etc.)

Usually, you are given the energy levels or the transition energies between levels, and you use this information to find the rotational constant.

What data do you actually have?

I don't need to calculate energy levels, just rotational constant B(e). I have to check statistical weight and be sure which J grades are valuable (odd or even). And from that information I have to plot two graph to get B(0) and B(1).
 
Nanosciencee said:
Just wavenumbers for different J grades in P and R branch, nothing else.

"P and R branch" suggests that you are calculating a ro-vibrational (Infrared or Raman) spectrum. You really have not provided enough information to allow me to give any help with what you are trying to do. Look at other posts in the "Homework" section of "Physics Forums" to see how people present these problems.
 
I don't get how to argue it. i can prove: evolution is the ability to adapt, whether it's progression or regression from some point of view, so if evolution is not constant then animal generations couldn`t stay alive for a big amount of time because when climate is changing this generations die. but they dont. so evolution is constant. but its not an argument, right? how to fing arguments when i only prove it.. analytically, i guess it called that (this is indirectly related to biology, im...
Back
Top