Ex3 Infared Spectroscopy

Wed, 06/05/2013 - 08:28 -- sewm02

Ex3 Infared Spectroscopy

 

Question 1: Diagram a Fourier Transform Infrared Spectrometer. Be sure to indicate how each and every part of the instrument functions.

Reference (Carolann)

Quantitative Chemical Analysis Textbook (7th ed) pg 446

Annotation

This page shows a good diagram for the Fourier Transform Infrared Spectrometer.

 

Question 1-A: List three optical materials that are commonly used in IR spectrometers and give their optical window ranges.

Reference (Carolann)

http://infrared.als.lbl.gov/IRwindows.html

Annotation

This website gives a wides range of optical materials, the ranges for the materials, the %T graph, and the properties of each material.

 

Question 1-B: name two different sources and explain what they are made of and how they work.

Reference (Carolann)

Quantitative Chemical Analysis (7th ed) pg 426 - 428

Annotation

The book tells what the sources do but not what they are made up of (in too much detail).

Reference (Justin)

Principles of Instrumental Analysis(5th ed) pg 389 - 390

Annotation

The book lists a few possible sources and give a brief description on how they work and what they are made of.

 

Question 1-C: Name any two detectors of your choice and describe in detail how they function.

Reference (Carolann)

Quantitative Chemical Analysis (7th ed) pg 437

Annotation

The book gives details about the detectors and how they function.

Reference (Justin)

Principles of Instrumental Analysis (5th ed) pg 390 - 392

Annotation

The book describes a few different transducers and how they function.

 

Question 1-D: Clearly describe with a drawing how a Michaelson Interferrometer functions.

Reference (Carolann)

Quantitative Chemical Analysis (7th ed) pg 443

Annotation

The book gives a great diagram and explanation of how the Michaelson Interferrometer functions.

 

Question 2: Explain what an intergerogram is and how signal is obtained from it.

Reference (Carolann)

Quantitative Chemical Analysis (7th ed) pg 445

Annotation

The book does a good job in explaining what an intergerogram is and gives examples of what some of the interference patterns look like.

 

Question 3: How does an attenuated total reflectance sample cell work?

= Reference (Carolann)

Annotation

This website is an educational resource because it is ran by Northwestern University. It gives an easy to understand way of how the attenuated total reflectance sample cells works.

 

Question 4: Draw and enery diagram for a harmonic oscillator showing the absorption of infrared light by a molecule. What are the selection rules for absorption of IR light?

Reference (Kristin)

http://hyperphysics.phy-astr.gsu.edu/hbase/quantum/hosc.html

Annotation

This was a good website because it gave a very clear picture and equations. It is from a university's website.

Reference (Justin)

http://jchemed.chem.wisc.edu/JCEDLib/LivTexts/pChem/JCE2005p1880_2LTXT/QuantumStates/Chapterwindows/Chapter6window.htm

Annotation

Heres a chapter from the book used in PChem, it describes a classical and quantum harmonic oscillator and talks about selction rules.(use the table of contents to find the harmonic oscillator sections)

 

Question 5: Draw the energy diagram for an anharmonic oscillator.

Reference (Kristin)

http://hussle.harvard.edu/~gabrielse/gabrielse/papers/1997/DressedPrl.pdf

Annotation

This is a bad site because it does not show you an anharmonic oscillator. It shows you something that involves an anharmonic oscillator but not the diagram that you need.

 

Question 6: Use your figures from problems 4 and 5 to explain what fundamental and overtones frequencies are.

Reference (Kristin)

http://hyperphysics.phy-astr.gsu.edu/Hbase/waves/funhar.html

Annotation

This college website gave a good defination of fundamental frequencies.

Reference (Kristin)

http://hyperphysics.phy-astr.gsu.edu/Hbase/sound/reson.html#resdef

Annotation

This website is connected to the previous one and it helps you understand the previous one more clearly.

Reference (Kristin)

http://www.lasalle.edu/academ/chem/ms/files/labs/vibration-rotation.doc

Annotation

This website gave a good defination of overtone frequencies and it is trustworthy because it is from a college website.

 

Question 7: How many vibrational modes are there for CS2 and C4H10. Indicate whether or not the following steches are infrared active or not.

Reference (Kristin)

http://jchemed.chem.wisc.edu/JCEWWW/Articles/WWW0001/index.html

Annotation

This is a good site becuase it is from a college and it gives you the equation to find the vibrational modes.

Reference (Kristin)

Annotation

This is a good college site because it tells you how what infrared active and inactive is.

 

Question 8: What is the purpose of the Laser in an FTIR spectrometer and how does it accomplish its function?

Reference (Kristin)

Annotation

This is a reliable site because it is from the government and it tells you what the laser is for.

Reference (Kristin)

http://www.thermo.com/eThermo/CMA/PDFs/Product/productPDF_21615.pdf

Annotation

This site was a little bit helpful. It gave diagrams but did not really answer what I needed it to. This seems like it might be reliable because it is from a business. But these is a chance that this might not be that reliable.

 

Question 9: The term Laser is an acronym. What does the term stand for, and how does a simple laser produce coherent light?

Reference (Matt Scanlon)

http://www.olympusmicro.com/primer/lightandcolor/laserhome.html http://www.olympusmicro.com/primer/java/lasers/stimulatedemission/

=== Annotation (matt scanlon ===

This has more information. Both these web sites are pretty good especially the second one.

Reference (Carolann)

http://www.acronymfinder.com/acronym.aspx?rec={93764C24-89E8-11D4-8351-00C04FC2C2BF}

Quantitative Chemical Analysis (7th ed) pg 428

Annotation

The website is an encyclopedia of acronyms, it tells what the word Laser stands for. The book tells how a laser produces light.