What kind of spectrum is emitted by a mercury bulb?
The emission of low-pressure mercury lamps exhibits a characteristic optical spectrum with pronounced spectral lines mostly in the visible and the ultraviolet spectral region, but partly also in the infrared.
What is the emission wavelength of mercury UV lamp?
The lamps can be constructed to emit primarily in the UV-A (around 400 nm) or UV-C (around 250 nm)….Emission line spectrum.
| Wavelength (nm) | Name (see photoresist) | Color |
|---|---|---|
| 253.7 | ultraviolet (UVC) | |
| 365.4 | I-line | ultraviolet (UVA) |
| 404.7 | H-line | violet |
| 435.8 | G-line | blue |
Do mercury lamps emit UV rays?
Under normal operating conditions mercury vapor lamps provide efficient, long-lasting sources of light. However, if the outer bulb breaks, and the inner tube continues to produce unshielded light, intense UV radiation is emitted.
What type of spectrum does mercury have?
The wavelengths of the prominent lines in mercury are purple (405 nm), blue (436 nm), blue- green (492 nm), greenish yellow (546 nm), yellow (577 nm), orange (623 nm), and red (691 nm).
What color light does mercury emit?
Sodium vapor and mercury vapor lamps emit yellow and bright blue light, respectively. They are very efficient, and provide high-intensity light suitable for illuminating large, open areas.
Why is mercury lamp used in spectrometer?
Low-pressure mercury lamps are available in versions that use the emitted ultraviolet lights directly, or as so-called fluorescent lamps that use a fluorescent material to convert the wavelength to a different wavelength. A spectrophotometer uses the mercury emission lines to calibrate the displayed wavelength values.
Is mercury lamp a monochromatic source or polychromatic?
A mercury vapor light source gives off light in the many spectrum and even in the invisible spectrum as UV radiation. So as a result, it is a polychromatic light source.
How does a mercury lamp produce light?
They produce light when electric current passes between two electrodes (also called cathodes) in a tube filled with low-pressure mercury vapor and inert gases, such as argon and krypton. The electric current excites the mercury vapor in the tube, generating radiant energy, primarily in the ultraviolet (UV) range.
Is mercury lamp a line source?
A mercury-vapor lamp is a gas discharge lamp that uses an electric arc through vaporized mercury to produce light and when subjected to dispersion gives line emission spectrum.
Why mercury lamp is used in spectrometer experiment?
What color does mercury vapor emit?
How are spectrum emissions determined?
The excitation spectrum of a given fluorochrome is determined in a similar manner by monitoring fluorescence emission at the wavelength of maximum intensity while the fluorophore is excited through a group of consecutive wavelengths. The emission maximum is chosen and only emission light at that wavelength is allowed to pass to the detector.
What causes the emission lines in a spectrum?
Continuous spectrum.
Why is the emission spectrum different for each gas?
Emission spectrum is different for different elements subjected to the same source of energy, due to the difference in the excitation energies of the different electrons of the substances. This is why the light emitted by each substance is different.
Why do elements give off an emission spectrum?
the transition probability.