The solid acid catalyst was H-USY zeolite (Si/Al = 11; 4.33 mmol H/g)characterized and used in a previous study. 2-methyl propane-213C(iC4-13CH) and 2-methyl propane-2d (iC4-CD) were synthesized in thelaboratory. A 50/50 mixture of the two gases was prepared for all in situ MASNMR experiments, which showed a final composition iC4-13CH/iC4-CD/iC4-CH of 42:53:5 according to NMR analyses. A specific homemade device was used to activate the catalyst, load the gazeous starting material, and seal the 4 mm NMR rotor without exposure to ambient atmosphere prior to each experiment. Around 50 mg of H-USY zeolite (0.216 mmol H) was first treated at 250 °C/54h and subsequently outgassed at room temperature for 3 h (<10-7mbar),and then, 0.5 mL of the gaseous mixture iC4-13CH/iC4-CD (0.4 mmol iC4/g)was introduced. Time resolved 1H and 13C{1H} MAS were performed on a 500 MHzBruker NMR spectrometer equipped with a conventional 4 mm MAS probehead withinthe 297-327 K temperature range. 我看我们的4mm的转子容积很小，好像上面写的是90μL，请问这0.5ml气体是怎么装进去的啊
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