TY - RPRT TI - Comparing Laser Desorption Ionization and Atmospheric Pressure Photoionization Coupled to Fourier Transform Ion Cyclotron Resonance Mass Spectrometry To Characterize Shale Oils at the Molecular Level AU - Yunjo Cho AU - Jang Mi Jin AU - Matthias Witt AU - Justin E. Birdwell AU - Jeong-Geol Na AU - Nam-Sun Roh AU - Sunghwan Kim PY - 2012 DO - 10.1021/ef3015662 UR - https://pubs.usgs.gov/publication/70045542 ID - 70045542 ER -