- #1

- 20

- 3

**Hi all,**the question is as follows:

1. Homework Statement

1. Homework Statement

From the energy level diagram for OH in the study guide, it can be seen that the first rotationally

excited level of OH (

^{2}∏

_{3=2}J =5\2) lies 120 K above the groundstate. What is the wavelength of radiation associated with a transition between the groundstate and the first excited level?

## Homework Equations

This is an energy level diagram that contains the relevant wavelengths, the numbers in blue are the transition wavelengths, which is what I require.

I would just like to know how to actually calculate the wavelengths.

## The Attempt at a Solution

The difference in frequencies is, for example from J = 5/2 to J = 3/2, 4365MHz where the main line frequencies of 1665MHz and 6030MHz are used. However, this corresponds to a wavelength of 0.068m, which is far off of the 0.000119m actual value. I suspect that I am calculating it incorrectly, I am unsure how to actually do it.