The Reason a Doubly Ionized Helium Gas,He III,will Not Produce

question 132

Multiple Choice

The reason a doubly ionized helium gas,He III,will not produce absorption lines in a stellar spectrum is that:

• A) a doubly ionized helium atom is simply a helium nucleus stripped of all its electrons, so it cannot absorb visible photons.
• B) the gas temperature on any star is always so high that electrons are excited beyond energy levels in the atoms from which visible photons can be absorbed.
• C) doubly ionized helium is meaningless because neutral helium contains only one electron.
• D) the gas temperature on star surfaces can never be hot enough to excite electrons in this atom to levels from which they will absorb visible photons.

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