After integrating the cis and trans-ν3 transition for each angle α, we observe a decrease of the proportion of cis-CH3ONO as α deviates from 0° when using N2 as the matrix host with a 500:1 N2:CH3ONO ratio. When α = 20°, the conformer abundance is 65% ± 3% cis-CH3ONO and 35% ± 1% trans-CH3ONO, as shown in Section 3.2. When α is decreased to α = 10°, the conformer abundance becomes 61% ± 3% cis and 39% ± 1% trans-CH3ONO. Changing the deposition angle by 10 degrees once more to achieve α = 0°-a perpendicular deposition-the conformer abundance is observed to be 58% ± 3% cis and 42% ± 1% trans-CH3ONO. Interestingly, the conformer abundance observed after a head-on deposition is nearly the room-temperature gasphase conformer abundance, in agreement with the sudden-trapping assumption typical for matrixisolation experiments. Passing perpendicular, the deposition angle was altered a final time to α = -10°. At this deposition angle we observe the conformer abundance reverts back towards a greater enhancement in cis-CH3ONO, resulting in 63 ± 3% cis and 37 ± 1% trans-CH3ONO. These results, as seen in Fig. , show that when CH3ONO in N2 is deposited at a larger angle of deposition, there is an enhancement of cis-CH3ONO. Fig. . Conformer abundance of matrix-isolated CH3ONO in N2 as a function of deposition angle (α) of the cis (blue) and trans (pink) ν3 transition of 500:1 N2:CH3ONO observed between 1690-1590 cm -1 . The blue and red solid lines represent the gas-phase conformer abundance of 57 ± 2% to 43 ± 2%, where the gas-phase abundance errors are represented in shaded grey.