Balmer Series Lab: 10/13/2008
 For the Lab covering the weeks of 10/13/2008 and 10/20/2008, I have chosen to do the Balmer series, where after calibration of an optical spectrometer, I will measure the spectral lines of hydrogen and deuterium.
 For the Lab, I am using a model SP200 5000 Volt, 10mA Spectrum Tube Power Supply, produced by ElectroTechnic Products, using spectral tubes of mercury, hydrogen, and deuterium.
 For measuring the data I am using a "constantdeviation" spectrometer, with a PellinBroca constantdeviation prism acting to determine the different wavelengths.
 The full procedure can be accessed in Professor Gold's Lab manual here
Measured values vs. known values of Mercury spectral wavelengths
Known Values 
Measured Values

404.7nm

404.2nm

435.8nm

435.9nm

546.1nm

546.0nm

577.0nm

576.9nm

579.0nm

579.0nm

690.75nm

700.0nm

 When calibrating the spectrometer, I had a wide variance in measurements, and had extreme differences in measurements depending on the wavelength. I settled on zeroing the spectrometer such that it had the closest values for the 546.1 and 577 nanometer readings and ignore that the red line had a significantly higher reading than what would be expected.
Measured values of Hydrogen spectral wavelengths
Line 
1 
2 
3

1

409.4nm

409.6nm

409.3nm

2

433.1nm

433.3nm

433.2nm

3

484.8nm

485.0nm

485.0nm

4

654.3nm

654.1nm

654.0nm

Measured values of Deuterium spectral wavelengths
Line 
1 
2 
3

1

409.4nm

409.3nm

409.5nm

2

433.2nm

433.1nm

433.2nm

3

484.5nm

485.0nm

484.8nm

4

654.1nm

653.8nm

654.5nm

 My method of measurements was to start at the highest wavelength possible and work my way down the spectrum, taking measurements as I go. After finishing a set of measurements for Hydrogen, I switched to the deuterium and took my measurements. I repeated the set 3 times, without touching the crystal and possibly changing the calibration in between sets.
 After completing these measurements, I decided to take another set of data with a different calibration so that I would have another calibration slope, hopefully giving more accurate results.
 For these data sets I am measuring from the lowest possible wavelength on the spectrometer up, with the calibration done first then hydrogen then deuterium.
Measured values vs. known values of Mercury spectral wavelengths
Known Values 
Measured Values

404.7nm

404.5nm

435.8nm

435.8nm

546.1nm

545.9nm

577.0nm

577.1nm

579.0nm

579.5nm

690.75nm

699.1nm

Measured values of Hydrogen spectral wavelengths
Line 
1 
2 
3

1

409.7nm

409.8nm

409.9nm

2

434.0nm

433.9nm

434.0nm

3

485.7nm

485.7nm

485.8nm

4

656.0nm

657.0nm

656.8nm

^{SJK 00:18, 3 November 2008 (EST)} 00:18, 3 November 2008 (EST) Looks like you did some deuterium measurements, but did not crunch the numbers, right? Well, it does look like they're indistinguishable in your measurements.
Measured values of Deuterium spectral wavelengths
Line 
1 
2 
3

1

409.8nm

409.7nm

410.0nm

2

433.9nm

433.9nm

434.0nm

3

485.0nm

485.3nm

485.4nm

4

656.1nm

656.5nm

656.8nm

 The last portion of the lab asks for us to measure the resolving power of the spectrometer using Sodium and the double yellow spectral lines at 589.0 and 589.6 nanometers. Unfortunately, we do not have a spectral tube containing sodium vapor, so I was unable to see if it was possible to measure the difference between the two lines.
