Abstract
The 3.3-micron spectrum of the planetary nebula NGC 7027 was searched for the R(0) line of the fundamental vibration-rotation band of the molecular ion HeH(+) without detecting it. The upper limit for detection is 3.7 x 10 to the -14th ergs/sq cm per sec, an improvement in excess of 100 over previous published attempts. This limit is low when compared to expectations based on analysis of molecular processes in gaseous nebulas. Likely causes are incorrect radiative association rates or inadequate representation of the nebular size or of the density distribution in the outer boundary of the nebular model used for the flux prediction. 39 references.
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