Bond lengths and angles of the nitric acid molecule, determined from microwave spectra (rotational spectroscopy). Angles and distances not drawn to scale. Reference: <cite style="font-style:normal">A. Peter Cox and José M. Riveros (1965). "Microwave Spectrum and Structure of Nitric Acid". <i>Journal of Chemical Physics</i> <b>42</b>: 3106-3112. <a href="https://en.wikipedia.org/wiki/Digital_object_identifier" class="extiw" title="w:Digital object identifier">DOI</a>:<a rel="nofollow" class="external text" href="https://doi.org/10.1063/1.1696387">10.1063/1.1696387</a>.</cite>
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