The infrared spectrum of KH

摘要

Reported here is the first observation of the infrared spectrum of KH. Fundamental bands and first hotbands of the39KH and41KH isotopic forms were measured at high resolution using a diode laser based spectrometer. An ac glow discharge through potassium vapor and hydrogen gas was used to produce KH. A combined isotopic Dunham coefficient analysis was used to fit all the spectra, with the Dunham coefficients for39KH coming out asY10=985.6714(30) cmminus;1,Y20=minus;14.9013(10) cmminus;1,Y01=3.416thinsp;40(10) cmminus;1,Y11=minus;0.085thinsp;313(26) cmminus;1,Y21=5.41(60)times;10minus;4cmminus;1,Y02=minus;1.6354(36)times;10minus;4cmminus;1,Y12=1.13(10)times;10minus;6cmminus;1,Y03=7.6(8)times;10minus;9cmminus;1, (quoted at 2sgr; error limits). A bond length of 2.241thinsp;152(16) Aring; and a Dunham corrected value for ohgr;eof 986.0505(30) cmminus;1are obtained. The pressure broadening of KH by H2and the chemistry of KH formation in the glow discharge plasma are also discussed.