C₅ and C₆ unsaturated aldehydes are a category of BVOCs released by plants in response to their wounds and stress. In this work, the gas phase UV absorption spectra of trans-2-pentenal (t-2P), trans-2-hexenal (t-2H) and 2-methyl-2-pentenal (2M2P) are determined between 240 and 400 nm, at room temperature and at pressures (1-9) torr. The reported UV absorption cross sections are (cm²molecule^-1): σ_{t-2P, 330} = (4.86 ± 0.53) x 10^-20, σ_{t-2H, 330} = (5.43 ± 0.57) x 10^-20 and σ_{2M2P, 320} = (6.62 ± 0.50) x 10^-20. Their photolysis constants as well as their atmospheric lifetimes toward photolysis were then estimated.

C ₅和C ₆不饱和醛是植物响应伤口和胁迫而释放的BVOC的一​​类。在这项工作中，测定了在240至400 nm之间的反式2-戊烯醛（t-2P），反式-2-己烯醛（t-2H）和2-甲基-2-戊烯醛（2M2P）的气相UV吸收光谱，在室温和压力（1-9）托下。报告的UV吸收截面为（cm ²分子^-1）：σt _-2P，330 =（4.86±0.53）x 10 ^-20，σt _-2H，330 =（5.43±0.57）x 10 ^-20和σ _2M2P，320 =（6.62±0.50）x 10 ^-20。然后估算了它们的光解常数以及大气中光解的寿命。