Hydrogen Gas Tube Spectrum Lhires III Micrometer Settings

Hydrogen Gas Tube Spectrum with C5
Lhires III Micrometer Settings

The Lhires III spectrograph micrometer was adjusted in increments of 0.50 while taking spectrum images of the gas tube.

There is about 50% overlap of the images when using micrometer increments of 0.50 and using the Sony NEX-6 camera.

If there is an emission line in the center of the image then in the previous smaller micrometer setting it will be in the right side of the image and the following larger micrometer setting it will be in the left side of the image.

The short wavelengths are on the left side of the spectrum image and the longer wavelengths are on the right side of the spectrum image.

Micrometer setting 13.0 is the shortest wavelength, larger micrometer settings are the longer wavelengths.

The Sony NEX-6 camera sensitivity decreases in the blue short wavelengths and in the red long wavelengths.

The below images are vertically cropped and they are resized 25% of the full size image.

Lhires Micrometer Setting 13.0

Spectrum span estimate ~423 Angstroms, ~3936 to ~4359 Angstroms
Faint Hydrogen delta 4101.74 Angstroms emission line in the Balmer series at the center-left of the spectrum.
Hydrogen gamma 4340.462 Angstroms emission line in the Balmer series at the right edge of the spectrum.
Sony NEX-6 camera blue sensitivity cutoff limits the spectrum in the blue short wavelengths and as a result the hydrogen 3970.072 Angstroms emission line is not seen in this spectrum as expected.
Image exposure: 30 seconds

Lhires Micrometer Setting 13.5

Spectrum span estimate ~422 Angstroms, ~4115 to ~4537 Angstroms
Hydrogen gamma 4340.462 Angstroms emission line in the Balmer series at the center of the spectrum.
Image exposure: 30 seconds

Lhires III Micrometer Setting 14.0

Spectrum span estimate ~423 Angstroms, ~4290 to ~4713 Angstroms
Hydrogen gamma 4340.462 Angstroms emission line in the Balmer series at the left edge of the spectrum.
Image exposure: 30 seconds

Lhires III Micrometer Setting 14.5

Spectrum span estimate ~423 Angstroms, ~4452 to ~4875 Angstroms
Hydrogen beta 4861.3615 Angstroms emission line in the Balmer series at the right egde of the spectrum.
Image exposure: 30 seconds

Lhires Micrometer Setting 15.0

Spectrum span estimate ~423 Angstroms, ~4615 to ~5038 Angstroms
Hydrogen beta 4861.3615 Angstroms emission line in the Balmer series at the center of the spectrum.
Image exposure: 1 seconds

Lhires III Micrometer Setting 15.5

Spectrum span estimate ~423 Angstroms, ~4777 to ~5200 Angstroms
No strong emission lines detected.

Lhires III Micrometer Setting 16.0

Spectrum span estimate ~423 Angstroms, ~4935 to ~5362 Angstroms
No strong emission lines detected.

Lhires III Micrometer Setting 16.5

Spectrum span estimate ~423 Angstroms, ~5102 to ~5525 Angstroms
No strong emission lines detected.

Lhires III Micrometer Setting 17.0

Spectrum span estimate ~423 Angstroms, ~5264 to ~5687 Angstroms
No strong emission lines detected.

Lhires III Micrometer Setting 17.5

Spectrum span estimate ~423 Angstroms, ~5426 to ~5849 Angstroms
No strong emission lines detected.

Lhires III Micrometer Setting 18.0

Spectrum span estimate ~423 Angstroms, ~5588 to ~6011 Angstroms
No strong emission lines detected.

Lhires III Micrometer Setting 18.5

Spectrum span estimate ~423 Angstroms, ~5751 to ~6164 Angstroms
No strong emission lines detected.

Lhires III Micrometer Setting 19.0

Spectrum span estimate ~423 Angstroms, ~5913 to ~6336 Angstroms
No strong emission lines detected.

Lhires III Micrometer Setting 19.5

Spectrum span estimate ~423 Angstroms, ~6075 to ~6498 Angstroms
No strong emission lines detected.

Lhires III Micrometer Setting 20.0

Spectrum span estimate ~423 Angstroms, ~6238 to ~6661 Angstroms
No strong emission lines detected.

Lhires Micrometer Setting 20.5

Spectrum span estimate ~423 Angstroms, ~6400 to ~6823 Angstroms
Hydrogen alpha 6562.8518 Angstroms emission line in the Balmer series at the center-left of the spectrum.
Sony NEX-6 sensitivity decreases in the red long wavelengths caused by the camera's infrared filter.
Image exposure: 2 seconds