Selective Interaction Between Negative Atmospheric Ions and Organic Compounds in Atmospheric

Journal of the American Society for Mass Spectrometry

Specific interaction between negative atmospheric ions and organic compounds in atmospheric pressure corona discharge ionization mass spectrometry

Kanako Sekimoto, Mami Sakai and Mitsuo Takayama*

Graduate School of Nanobioscience, Yokohama City University, Japan

E-mail address of the corresponding author*:

Electronic Supplementary Material

Figure S1. Negative ion mass spectra of methanol (Mr 32; entry 1 in Table 2) obtained using the following discharge conditions: (a) (V kV,  rad) = (-1.9, /2); (b) (-3.1, /4); (c) (-2.3, 0); and (d) (-3.9, 0). The asterisk (*) represents the ion peaks of the atmospheric ions shown in Figure 2 and their hydrates.

Figure S2. Negative ion mass spectra of acetic acid (Mr 60; entry 2 in Table 2) obtained using the following discharge conditions: (a) (V kV,  rad) = (-1.9, /2); (b) (-3.1, /4); (c) (-2.3, 0); and (d) (-3.9, 0). The asterisk (*) represents the ion peaks of the atmospheric ions shown in Figure 2.

Figure S3. Negative ion mass spectra of 2-phenylethanol (Mr 122; entry 3 in Table 2) obtained using the following discharge conditions: (a) (V kV,  rad) = (-1.9, /2); (b) (-3.1, /4); (c) (-2.3, 0); and (d) (-3.9, 0). The asterisk (*) represents the ion peaks of the atmospheric ions shown in Figure 2 and their hydrates.

Figure S4. Negative ion mass spectra of benzoic acid (Mr 122; entry 4 in Table 2) obtained using the following discharge conditions: (a) (V kV,  rad) = (-1.9, /2); (b) (-3.1, /4); (c) (-2.3, 0); and (d) (-3.9, 0). The asterisk (*) represents the ion peaks of the atmospheric ions shown in Figure 2 and their hydrates.

Figure S5. Negative ion mass spectra of phenol (Mr 94; entry 5 in Table 2) obtained using the following discharge conditions: (a) (V kV,  rad) = (-1.9, /2); (b) (-3.1, /4); (c) (-2.3, 0); and (d) (-3.9, 0). The asterisk (*) represents the ion peaks of the atmospheric ions shown in Figure 2.

Figure S6. Negative ion mass spectra of aniline (Mr 93; entry 6 in Table 2) obtained using the following discharge conditions: (a) (V kV,  rad) = (-1.9, /2); (b) (-3.1, /4); (c) (-2.3, 0); and (d) (-3.9, 0). The asterisk (*) represents the ion peaks of the atmospheric ions shown in Figure 2 and their hydrates.

Figure S7. Negative ion mass spectra of phenylethylamine (Mr 121; entry 7 in Table 2) obtained using the following discharge conditions: (a) (V kV,  rad) = (-1.9, /2); (b) (-3.1, /4); (c) (-2.3, 0); and (d) (-3.9, 0). The asterisk (*) represents the ion peaks of the atmospheric ions shown in Figure 2 and their hydrates.

Figure S8. Negative ion mass spectra of 4-aminobutanoic acid (Mr 103; entry 8 in Table 2) obtained using the following discharge conditions: (a) (V kV,  rad) = (-1.9, /2); (b) (-3.1, /4); (c) (-2.3, 0); and (d) (-3.9, 0). The asterisk (*) represents the ion peaks of the atmospheric ions shown in Figure 2.

Figure S9. Negative ion mass spectra of L-serine (Mr 105; entry 9 in Table 2) obtained using the following discharge conditions: (a) (V kV,  rad) = (-1.9, /2); (b) (-3.1, /4); (c) (-2.3, 0); and (d) (-3.9, 0). The asterisk (*) represents the ion peaks of the atmospheric ions shown in Figure 2.

Figure S10. Negative ion mass spectra of L-phenylalanine (Mr 165; entry 11 in Table 2) obtained using the following discharge conditions: (a) (V kV,  rad) = (-1.9, /2); (b) (-3.1, /4); (c) (-2.3, 0); and (d) (-3.9, 0). The asterisk (*) represents the ion peaks of the atmospheric ions shown in Figure 2.