Calibrating Argon Spectrum with MicroLab Spectrometer Model 141

In summary: If you are looking for something more specific, try the Yablochkov lamps. They emit in the near infrared and have a good spectral resolution.I'll check out fluorescent lamps.
  • #1
jagadeeshr
11
0
Hi,

I need some help to calibrate argon spectrum.

I have a MicroLab Spectrometer (Model 141) to obtain spectral images of argon plasma. To calibrate the spectral images, I need a reference of known wavelength.

Usually, a discharge tube is used to obtain the reference spectrum. However, I cannot procure it now due to budget issues.

Another method is to is to fill a vial with chemical of known absorption/transmittance wavelength, and place it in the spectrometer. The wavelength at which the liquid absorbs or transmits light can be used as a references to calibrate the unknown spectrum.

Can you suggest any chemical that absorbs or transmits light in the visible range (400 to 700 nm)?

I could only think of chlorophyll. Maximum absorption at 430 & 662 nm for chlorophyll a and 453 & 642 nm for cholorophyll b.
http://www1.biologie.uni-hamburg.de/b-online/e24/3.htm

Thank you
Jagadeesh
 
Last edited:
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  • #2
You can get gas discharge tubes for a few dollars. I don't know your budget, but it will be hard to get anything cheaper than that. Better ones cost more, but that is always the case.

Optical filters can have very narrow transmission or absorption windows. Sodium, rubidium, ... in flames produce narrow lines.
 
  • #3
mfb said:
You can get gas discharge tubes for a few dollars. I don't know your budget, but it will be hard to get anything cheaper than that. Better ones cost more, but that is always the case.

Optical filters can have very narrow transmission or absorption windows. Sodium, rubidium, ... in flames produce narrow lines.

Thanks for the reply. The project budget will be approved in March, until then no "official" purchases can be made. So, I was looking for cheap alternatives.
 
  • #4
A few dollars looks quite cheap, and you might be able to use it at home afterwards if you buy it yourself.
 
  • #5
How about Xe lamps? They have a sharp emission peak at 467 nm.

If you are looking for chemicals, try known lanthanides salts. Excite it with UV (around 375 nm) and most of the time you will see their emission. Terbium or Europium salts show sharp emission peak at around 545 nm and 612 nm, respectively. Terbium is a little bit costly, but Europium nitrate cost around $60 per gram.

I have Europium nitrate at hand. If you want, I can give you the spectrum.
Better yet, you can also try Fluorescent lamps. They contain Eu3+ doped Y2O3 that emits in 610 nm or something.
 
  • #7
Fluorescent lamps also show the lines of mercury.
 
  • #8
Well of course, they are low vapor mercury lamp.
 

1. What is the purpose of calibrating the Argon spectrum using the MicroLab Spectrometer Model 141?

The purpose of calibrating the Argon spectrum is to ensure accurate and precise measurements of the spectral lines emitted by Argon gas. This is important for various scientific and industrial applications, such as determining the composition of a gas sample or analyzing the properties of different materials.

2. How does the MicroLab Spectrometer Model 141 calibrate the Argon spectrum?

The MicroLab Spectrometer Model 141 uses a calibration lamp that emits known spectral lines of Argon gas. These lines are then compared to the spectral lines emitted by the sample, allowing the instrument to accurately determine the wavelengths of the sample's spectral lines.

3. Is calibrating the Argon spectrum a time-consuming process?

No, calibrating the Argon spectrum using the MicroLab Spectrometer Model 141 is a quick and efficient process. The instrument is designed to automatically calibrate itself when turned on, requiring minimal user input and no additional calibration steps.

4. What are the benefits of using the MicroLab Spectrometer Model 141 for calibrating the Argon spectrum?

The MicroLab Spectrometer Model 141 offers high accuracy and precision in calibrating the Argon spectrum, making it a valuable tool for various research and industrial purposes. It is also user-friendly and versatile, allowing for easy customization and analysis of spectral data.

5. How often should the Argon spectrum be calibrated using the MicroLab Spectrometer Model 141?

The frequency of calibration depends on the specific instrument and its usage. In general, it is recommended to calibrate the Argon spectrum at the beginning of each day or before each use to ensure accurate results. However, if the instrument is used frequently or for critical applications, more frequent calibration may be necessary.

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