Observations of different core water cluster ions Y-(H[!sub]2[!/sub]O)[!i][!sub]n[!/sub][!/i] (Y = O[!sub]2[!/sub], HO[!i][!sub]x[!/sub][!/i], NO[!i][!sub]x[!/sub][!/i], CO[!i][!sub]x[!/sub][!/i]) and magic number in atmospheric pressure negative corona discharge mass spectrometry
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