FTIR Data

Molecular Spectroscopy of Acetylene

Pre-Lab Questions

Please answer the following questions and attach them to your lab report before submission. These questions will account for the pre-lab and performance points and will be worth 50 points in total. Each question is worth a total of 10 points. Please limit your answer to each question to a few sentences.

1. The following energy diagram contains vibrational-rotational transitions. Answer all the questions.

a. Label all electronic, vibrational and rotational energy levels using n, V and J quantum numbers.

b. Identify P and R branches.

c. Label transitions in each of P and R branches with respect to initial and final J values.

Tips: use shapes form Insert menu for labeling

Answer:

2. The following figure shows two systems used for synthesizing C2H2 (left) and C2D2 (right). The only difference is the cold finger. Briefly explain its purpose.

Answer:

3. In the experimental demo video, the narrator mentioned a mistake that was made during filming. What was he talking about? What was the result of that mistake?

Answer:

4. The following spectra contains vibrational-rotational peaks of C2H2. Identify o and label at least 10 peaks in each of P and R branches with respect to initial J values. (Tips: use shapes form Insert menu)

5. Using slopes from the following equation and the graphs calculate , , and .

Answer: