The Nature of the Iodine Line 2062a

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Abstract
Dissociated iodine vapor at 1100° to 1500°C in a quartz tube failed to show any resonance fluorescence of the 2062 line in a 78 minute exposure in the same apparatus in which mercury vapor gave a detectable fluorescence of the 2537 line in a 1 second exposure. This fact and the narrowness of the 2062 line in absorption, seem to indicate that the lower level involved in the transition producing this line is not the normal state of the atom but is a slightly higher one. A calculation based on the observed line width shows that this level is probably at least 0.545 volt above the normal level and suggests that there may be a resonance line of atomic iodine at about 1800A.

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