complicate their detection with common approaches but improves their applicability for LD: a very low vapor pressure, e.g., RDX (hexahydro-1,3,5-trinitro-1,3,5-triazine) has 4.4 × 10−9 mPa or HNS (hexanitrostilbene) with 6.2 × 10−18 mPa [27], and many of them are ...