INTERNAL ENERGY-DISTRIBUTIONS OF LASER ABLATED SPECIES FROM YBA2CU3O7-DELTA

被引:56
作者
OTIS, CE [1 ]
GOODWIN, PM [1 ]
机构
[1] LOS ALAMOS NATL LAB,LOS ALAMOS,NM 87545
关键词
D O I
10.1063/1.353186
中图分类号
O59 [应用物理学];
学科分类号
摘要
The first simultaneous measurements of the ground-state translational, rotational, and vibrational energy distributions of a laser ablated diatomic molecule (YO) liberated during a 351 nm excimer laser ablation of YBa2Cu3O7-delta, are reported. In addition, the translational energy distributions of Y, Y+, Ba, Ba+, and Cu are reported. Measurements made at low and high fluences on YO indicate that there are very large differences in the ''temperatures'' inferred between the translational and the vibrational/rotational energy channels, implying that energy is partitioned in a very nonequilibrium fashion in the expanding plume. A measurement of the rotational and vibrational temperatures shows that the internal degrees of freedom are equilibrated in the expansion plume (Boltzmann distributions) with a temperature of approximately 1000 K being observed at normal processing fluences. The translational energy distributions of YO are observed to fit a shifted Boltzmann distribution at high fluences. The atomic species monitored all display non-Boltzmann velocity distributions at high fluences. The peak of the observed velocity distributions corresponds to energies as high as 10 eV for the YO neutral diatomic and up to several hundred eV for Ba+ at ablation fluences of 5 J/cm2. Bimodal velocity distributions are observed for the Cu, Ba, and Y neutral atoms at high incident fluences, implying ion-electron recombination as a partial source of the high neutral velocities.
引用
收藏
页码:1957 / 1964
页数:8
相关论文
共 39 条
[1]   SPECTROSCOPIC ANALYSIS OF ELECTRONICALLY EXCITED SPECIES IN XECL EXCIMER LASER-INDUCED PLASMAS FROM THE ABLATED HIGH-TEMPERATURE SUPERCONDUCTOR YBA2CU3O7 [J].
AUCIELLO, O ;
ATHAVALE, S ;
HANKINS, OE ;
SITO, M ;
SCHREINER, AF ;
BIUNNO, N .
APPLIED PHYSICS LETTERS, 1988, 53 (01) :72-74
[2]   LASER ABLATION OF BULK YBA2CU3O7-DELTA-AND CLUSTER EMISSION [J].
BECKER, CH ;
PALLIX, JB .
JOURNAL OF APPLIED PHYSICS, 1988, 64 (10) :5152-5156
[3]   THE EMISSION-SPECTRUM OF YTTRIUM MONOXIDE - NEW ROTATIONAL AND VIBRATIONAL RESULTS ON THE A2-PI-X2-SIGMA+ SYSTEM [J].
BERNARD, A ;
GRAVINA, R .
ASTROPHYSICAL JOURNAL SUPPLEMENT SERIES, 1983, 52 (04) :443-450
[4]   FOURIER-TRANSFORM SPECTROSCOPY - EXTENSIVE ANALYSIS OF THE A2-PI-]X2-SIGMA+ AND B2-SIGMA+-]X2-SIGMA+ SYSTEMS OF YTTRIUM-OXIDE [J].
BERNARD, A ;
BACIS, R ;
LUC, P .
ASTROPHYSICAL JOURNAL, 1979, 227 (01) :338-&
[5]   OBSERVATION OF TRAPPED O2 IN HIGH-TC METAL-OXIDE SUPERCONDUCTORS - REPLY [J].
CHEN, CH ;
PHILLIPS, RC ;
PAYNE, MG .
PHYSICAL REVIEW B, 1990, 41 (07) :4783-4783
[6]   LASER DESORPTION MASS-SPECTRA OF YBA2CU3O7-X [J].
CHEN, CH ;
MURPHY, TM ;
PHILLIPS, RC .
APPLIED PHYSICS LETTERS, 1990, 57 (09) :937-939
[7]   OBSERVATION OF TRAPPED O2 IN HIGH-TC METAL-OXIDE SUPERCONDUCTORS [J].
CHEN, CH ;
PHILLIPS, RC ;
MCCANN, MP .
PHYSICAL REVIEW B, 1989, 39 (04) :2744-2747
[8]   LASER ABLATION OF Y2O3 IN AN OXYGEN ATMOSPHERE [J].
DYE, RC ;
MUENCHAUSEN, RE ;
NOGAR, NS .
CHEMICAL PHYSICS LETTERS, 1991, 181 (06) :531-536
[9]   SPECTROSCOPIC AND ION PROBE MEASUREMENTS OF KRF LASER ABLATED Y-BA-CU-O BULK SAMPLES [J].
DYER, PE ;
GREENOUGH, RD ;
ISSA, A ;
KEY, PH .
APPLIED PHYSICS LETTERS, 1988, 53 (06) :534-536
[10]   DYNAMICS OF EXCIMER LASER ABLATION OF SUPERCONDUCTORS IN AN OXYGEN ENVIRONMENT [J].
DYER, PE ;
ISSA, A ;
KEY, PH .
APPLIED PHYSICS LETTERS, 1990, 57 (02) :186-188