(1) One example of the application of this technique is in the distinction of trans and gauche rotational isomers.(2) Where they are on opposite sides of the double bond, the arrangement is the trans arrangement.(3) Initially the propellers sit on opposite sides of the molecule: the so-called trans isomer.(4) Photoisomerization studies were carried out using trans isomers as starting materials.(5) However, the extent of trans isomer was greater in the extracted samples.