[P CHem] HCL/DCL r and p branch J value assignment

Click For Summary
The discussion focuses on assigning J values for the P and R branches of various HCl and DCl isotopes. The user expresses confusion about how to properly assign these values, noting that R branches can start at 0 while P branches begin at 1. They mention having conducted IR spectroscopy and identifying wave numbers, but struggle with the transition from these numbers to J values. The user also highlights the distinction in peak intensities related to isotopes and seeks clarification on the difference between J and J' values. Understanding these assignments is crucial for accurate interpretation of spectral data.
Chickenpoxpie
Messages
7
Reaction score
0

Homework Statement


Assign J values for P and R branches of H35cl, H37cl, d35cl, and d37cl compounds.


Homework Equations





The Attempt at a Solution


I have a fundamental IR spectra I did on and HCL/DCL compound. I'm extremely confused how to assign J values. I've been looking online and see R can be 0, 1, 2, 3, etc but P starts at 1,2,3, etc. How did they assign these values?

What I do know
I peaked picks so I know the wave numbers.
I can tell the P branch form the R because as the wave numbers get smaller they get more spread out.
I know the less intense peaks of the doublets are the H37CL or D37CL b/c it is a less common isotope and intensities are based on number of species.
 
Physics news on Phys.org
I'm stuck here too! How do you go from wave numbers to j values. What's the difference between j and j'?
 

Similar threads

Undergrad Combination differences with spin
  • · Replies 1 ·
Replies
1
Views
2K
Undergrad P & Q branches confusion in rovibrational transitions + rant
  • · Replies 7 ·
Replies
7
Views
4K
Derive the relation between the P & R branches
  • · Replies 2 ·
Replies
2
Views
2K
Which Asset Should You Choose Based on Present Value?
  • · Replies 1 ·
Replies
1
Views
2K
Understanding H NMR Coupling Constants: Matching J-Values vs. Peak Alignment
  • · Replies 1 ·
Replies
1
Views
4K
I in assigning R/S stereochemistyr
  • · Replies 1 ·
Replies
1
Views
6K
What are the key steps to analyzing an NMR spectrum?
  • · Replies 1 ·
Replies
1
Views
4K
Finding the value of each color?
  • · Replies 3 ·
Replies
3
Views
1K
Comp Sci Help with coin game C++ assignment?
  • · Replies 6 ·
Replies
6
Views
3K
How to appropriately assign sigma values (uncertainty)
  • · Replies 9 ·
Replies
9
Views
2K