In　order　to　investigate　a　noise-like　signal　appearing　in　dynamic　mode　measurement　during　laser　flash　photolysis　experiments,　five　compounds　were　chosen　which　show　this　abnormal　phenomenon.　The　reproducibility　of　this　phenomenon　was　done　repeatedly,　indicating　that　it　originates　from　each　molecular　structural　property.　Also　their　two　regulation　pattern　or　features　were　found　by　our　analysis.　One　is　a　U-shaped　curve　of　main　frequency　intensity　with　time　and　it　seems　to　be　directly　related　to　the　concentration　of　the　T-1　excited　state.　The　other　is　a　high　damping　oscillation　curve　of　the　frequency　shift　with　time　and　this　curve　seems　to　be　indicating　an　energy　transportation　process　from　light　into　chemical　energy.　Finally,　a　possible　origin　of　hydrogen　nuclear　optical　resonance　was　proposed　for　the　abnormal　signal.　(C)　2013　Elsevier　B.V.　All　rights　reserved.