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Since hydrogen preferentially etches the amorphous phase of the film [ 27 ] , a higher fraction of crystalline phase was left in the high-power-deposited film . Comparative studies of the reflectivity at different times and the etch rate behaviour in dependence on the laser fluence show that the in situ measured surface modification begins just at the etch threshold fluence and correlates further with etch rate behaviour and the etched surface appearance . This book is odd , exquisite and trivial , like a drawing on a Ping-Pong ball or an etching in a bar of soap . The metal is corroded locally by the photoresist developer and etches more slowly than the surrounding metal . The process , which has already been used as part of the European Space Agency ’ s Rosetta mission , is simple : An ion beam would etch your photo into the chip ’ s surface , and the result could be viewed with a microscope . This is because the hydrogen plasma etches the surface and makes it more active . The proposed role of the O2 addition is to aid in polymer removal and prevent the occurrence of etch stop . The country 's population had passed the fifty-million mark and American footprints etched the entire continent " sea to shining sea " . The hard-baked polymeric material that is normally used for separating pole pieces and Cu coil turns can easily be etched in an oxygen-based plasma . However , by the late seventies , I was back to hand drawing on uncoated deep etch ball grained plates , using an average of eight or more plates for an edition of lithographs . All etched stones are eight inches wide and vary in height : three , four , six , eight and twelve inches . The bronze soldiers were to have been backed by a polished granite wall etched with photographs of service personnel . As in the GCMO , the stack etch process must not change the critical dimension of the etched feature . Wet etching in buffered HF solution ( 6:1 of water : buffered HF ) indicated less than a + -5 % variation in etching rate with depth and across a 200-mm-diameter wafer . The morning section on fabrication will cover photolithography , thin film deposition , wet and dry etching , including extensive discussions of deep reactive ion etching and wafer bonding . For planar surfaces , impressive experimental techniques exist that can be used to obtain the information required to develop a quantitative description of plasma-surface interactions relevant to plasma etching .