7B10.10 Atomic Emission Spectra

Show emission spectra of single element. Gratings available for students. H, He, Ne, Hg, Ar, & Kr available.

Setup Requirements: Minimal. Pass out gratings to each student like that shown in picture.

Equations: None

Safety Issues:High voltage shock hazard. Fragile glass tubes get hot. You may want gloves to remove hot tube.

7B10.11 Sodium Emission Spectrum

Show emission spectrum of Sodium. Gratings available for students.

Setup Requirements: Minimal. Put metal cover over glass tube. Cover most of opening with dark tape. Allow about/8 inch vertical gap. Turn out room lights.

Equations:None

Safety Issues: High voltage shock hazard. Fragile glass tube.

7B10.12 Molecular Emission Spectra

Show emission spectra of two element molecules. Gratings available for students. Nitrogen (band spectra),Carbon Dioxide and Water available.

Setup Requirements: Minimal

Equations: None

Safety Issues: High voltage shock hazard. Fragile glass tubes get hot. You may want gloves to remove hot tube.

7B10.13 Emission Spectra Plus Continuous Spectra

An emission spectrum is placed above a continuous spectrum. Gratings available for students.

Setup Requirements: Assembled as needed. Use nightlight size bulb for continuous spectrum.

Equations: None

Safety Issues: High voltage shock hazard. Fragile glass tubes get hot. You may want gloves to remove hot tube. AC line voltage present.

7B11.50 Absorption Spectra 

Not available. This demonstration is being changed.

White light passing through various colored liquids will produce broad absorption bands.

Setup Requirements: Ask ahead of time. Liquids prepared as needed. Use projector with slit as light source. Pass out diffraction gratings to students. A different light source may be provided instead of one in picture. 

Equations: None 

Safety Issues: Liquids may be poisonous.

7B35.75 Plasma Globe

The sphere contains a mixture of gases at low pressure. The sphere in the center is connected to a high voltage source. Touching the outer sphere with a finger will produce a lightening like discharge directed at your finger. A smaller battery powered version is also available.

Setup Requirements: Minimal

Equations: None

Safety Issues: Shock hazard if broken, gets hot if keep finger in place on globe, ozone buildup around globe if leave on..