Attosecond pulsessenola diphiri tsa tieho ya nako
Bo-rasaense ba United States, ka thuso ea attosecond pulses, ba senotse tlhahisoleseding e ncha mabapi lephello ea photoelectric: tsetlhahiso ea motlakaseHo lieha ho fihla ho li-attoseconds tse 700, nako e telele ho feta kamoo ho neng ho lebelletsoe pele. Patlisiso ena ea morao-rao e phephetsa mehlala e teng ea theory mme e kenya letsoho kutloisisong e tebileng ea litšebelisano lipakeng tsa lielektrone, e lebisang ho nts'etsopele ea mahlale a kang li-semiconductors le lisele tsa letsatsi.
Phello ea photoelectric e bua ka ketsahalo ea hore ha leseli le khanyetsa molek'hule kapa athomo holim'a tšepe, photon e kopana le molek'hule kapa athomo ebe e ntša lielektrone. Phello ena hase feela e 'ngoe ea metheo ea bohlokoa ea quantum mechanics, empa hape e na le phello e tebileng ho fisiks ea morao-rao, k'hemistri le saense ea thepa. Leha ho le joalo, tšimong ena, seo ho thoeng ke nako ea ho lieha ha photoemission e 'nile ea e-ba taba e tsosang khang,' me mefuta e fapa-fapaneng ea likhopolo-taba e hlalositse ka likhato tse fapaneng, empa ha ho tumellano e kopaneng e entsoeng.
Ha lefapha la saense ea attosecond le ntlafetse haholo lilemong tsa morao tjena, sesebelisoa sena se hlahang se fana ka tsela eo ho seng mohla e kileng ea e-ba teng ea ho hlahloba lefatše le sa bonahaleng. Ka ho lekanya ka nepo liketsahalo tse etsahalang sekala sa nako e khuts'oane haholo, bafuputsi ba khona ho fumana leseli le eketsehileng mabapi le boitšoaro bo matla ba likaroloana. Phuputsong ea morao-rao, ba sebelisitse letoto la maqhubu a matla a X-ray a hlahisoang ke mohloli o kopanetsoeng oa leseli Setsing sa Stanford Linac (SLAC), se ileng sa nka karolo ea bilione ea motsotsoana (attosecond), ho ionize lielektrone tsa mantlha le. "raha" ho tsoa molekhuleng o thabileng.
Ho tsoela pele ho hlahloba litsela tsa li-elektronike tsena tse lokollotsoeng, li ne li sebelisoa ka bomong li thabilemaqhubu a laserho lekanya nako ea ho tsoa ha lielektrone ka mahlakoreng a fapaneng. Mokhoa ona o ile oa ba lumella ho bala ka nepo phapang ea bohlokoa pakeng tsa linako tse fapaneng tse bakoang ke ho sebelisana pakeng tsa li-electrone, ho tiisa hore ho lieha ho ka fihla ho 700 attoseconds. Ke habohlokoa ho hlokomela hore ho sibolloa hona ha ho tiise maikutlo a mang a fetileng feela, empa hape ho hlahisa lipotso tse ncha, ho etsa hore likhopolo tse amehang li hloke ho hlahlojoa hape le ho ntlafatsoa.
Ho feta moo, thuto e totobatsa bohlokoa ba ho lekanya le ho hlalosa tieho ena ea nako, e leng ea bohlokoa ho utloisisa liphello tsa liteko. Ho protheine crystallography, litšoantšo tsa bongaka, le lits'ebetso tse ling tsa bohlokoa tse amanang le tšebelisano ea X-ray le taba, lintlha tsena e tla ba motheo oa bohlokoa oa ho ntlafatsa mekhoa ea tekheniki le ho ntlafatsa boleng ba litšoantšo. Ka hona, sehlopha se rera ho tsoela pele ho hlahloba matla a elektroniki a mefuta e fapaneng ea limolek'hule e le ho senola tlhahisoleseling e ncha mabapi le boits'oaro ba elektroniki lits'ebetsong tse rarahaneng le kamano ea bona le sebopeho sa limolek'hule, ho rala motheo o tiileng oa data bakeng sa nts'etsopele ea mahlale a amanang le ona. nakong e tlang.
Nako ea poso: Sep-24-2024